John Doe v. James Mattis [REISSUED OPINION] ( 2019 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued April 5, 2018                     Decided May 7, 2018
    Reargued April 27, 2018                 Reissued June 28, 2019
    No. 18-5032
    JOHN DOE,
    APPELLEE
    v.
    JAMES MATTIS, IN HIS OFFICIAL CAPACITY AS SECRETARY OF
    DEFENSE,
    APPELLANT
    Consolidated with 18-5110
    Appeal from the United States District Court
    for the District of Columbia
    (No. 1:17-cv-02069)
    James M. Burnham, Attorney, U.S. Department of Justice,
    argued the cause for appellant. With him on the briefs were
    Jessie K. Liu, U.S. Attorney, Matthew M. Collette and Sonia
    M. Carson, Attorneys. Catherine H. Dorsey, Attorney, entered
    an appearance.
    Jonathan L. Hafetz argued the cause for appellee. With
    him on the briefs were Arthur B. Spitzer and Hina Shamsi.
    2
    Before: HENDERSON, SRINIVASAN, and WILKINS, Circuit
    Judges.
    Opinion for the Court filed by Circuit Judge SRINIVASAN,
    with whom Circuit Judge WILKINS joins.
    Dissenting opinion filed by Circuit Judge HENDERSON.
    SRINIVASAN, Circuit Judge: This case involves a United
    States citizen who has been detained by the United States
    military in Iraq for several months. He seeks release from
    military custody in a habeas corpus action brought under the
    pseudonym John Doe. Doe is a citizen not only of the United
    States but also of Saudi Arabia.
    Doe was initially captured in Syrian territory controlled by
    the Islamic State of Iraq and the Levant (ISIL). The
    Department of Defense determined that he is an enemy
    combatant for ISIL, and the Department has been detaining him
    at a military facility in Iraq. Doe’s habeas petition contends
    that he must be released because, he claims, ISIL combatants
    do not come within any existing authorization for use of
    military force. He also contends that he is not in fact an ISIL
    combatant. At this stage of the proceedings, no court has
    addressed the merits of those claims.
    This appeal instead concerns a separate claim by Doe: that
    the government, while his habeas petition remains pending,
    cannot forcibly—and irrevocably—transfer him to the custody
    of another country. Transfer of Doe to another country’s
    custody would, naturally, obviate any occasion to seek release
    from physical custody at the hands of the United States. In
    connection with the possibility of Doe’s forcible transfer to the
    custody of another country, the district court has entered two
    orders we now review.
    3
    In the first order, the court required the government to give
    72 hours’ notice before transferring Doe to the custody of any
    other country. The notice period was meant to afford the court
    an opportunity to review the circumstances of a planned
    transfer before it takes place. The government seeks to set
    aside any obligation to give advance notice with regard to two
    specific countries. We will refer to those countries as Country
    A and Country B because of the government’s desire to
    withhold public release of their identities due to apparent
    sensitivities associated with ongoing or future diplomatic
    discussions.
    The district court’s second order came about after the
    government reached an agreement with Country B to transfer
    Doe to its custody. The government gave the district court the
    requisite notice of its intent to transfer Doe to that country. The
    court then enjoined the government from effecting the transfer.
    In the court’s view, the government had failed to demonstrate
    the necessary legal authority (specifically, a statute or treaty)
    for the transfer.
    We sustain both of the district court’s orders. In claiming
    the authority to forcibly transfer an American citizen held
    abroad to the custody of another country, the government
    ultimately relies on two species of argument. Neither, in our
    view, gives the government the power to effect its desired
    handover of Doe to Country B, at least as things currently
    stand.
    The first rationale advanced by the government has no
    necessary grounding in Doe’s designation as an enemy
    combatant or in the military’s authority under the law of war.
    Rather, the government relies on Supreme Court decisions
    recognizing that, when a foreign country wants to prosecute an
    American citizen already present in its territory for a crime
    4
    committed within its borders, the Executive can relinquish her
    to that country’s custody for purposes of criminal proceedings.
    See Munaf v. Geren, 
    553 U.S. 674
    (2008); Wilson v. Girard,
    
    354 U.S. 524
    (1957). Those decisions, on the government’s
    reading, extend past their facts in two ways: (i) they enable a
    forcible transfer of a U.S. citizen to a different foreign country
    than the one in which she is already present, and (ii) they enable
    a forcible transfer as long as the receiving country has some
    legitimate sovereign interest in her (whether or not related to
    criminal prosecution). No. 18-5032, Gov’t Opening Br. 23-25.
    We cannot accept the government’s argument. We know
    of no instance—in the history of the United States—in which
    the government has taken an American citizen found in one
    foreign country and forcibly transferred her to the custody of
    another foreign country. Under the logic of the government’s
    position, it could pick up an American traveling in Europe and
    involuntarily relinquish her to, say, the custody of Afghanistan,
    as long as Afghanistan is thought to have some cognizable
    sovereign interest in her. We cannot conclude that the
    government possesses that kind of authority over a U.S. citizen,
    at least without a statute or treaty specifically providing for it.
    The government’s second line of argument differs from its
    first in an important respect: the second argument turns on
    Doe’s status as an alleged enemy combatant and on the
    military’s attendant authority in a time of war. We agree with
    the government that, if Doe is an enemy combatant, the military
    can transfer him to the custody of Country B, a partner in the
    campaign against ISIL. But under the precedents of the
    Supreme Court and our court, two conditions must exist for an
    American citizen to be subject to military transfer or detention
    as an enemy combatant: (i) there must be legal authority for
    the Executive to wage war against the enemy, and (ii) there
    must be an opportunity for the citizen to contest the factual
    5
    determination that he is an enemy combatant fighting on behalf
    of that enemy. See Hamdi v. Rumsfeld, 
    542 U.S. 507
    , 517, 533
    (2004) (plurality opinion); Omar v. McHugh, 
    646 F.3d 13
    , 24
    (D.C. Cir. 2011). Neither the legal inquiry nor the factual
    inquiry has taken place in this case. In the absence of those
    inquiries, we see no basis to set aside the district court’s
    injunction barring the forcible transfer of Doe to Country B.
    What about the district court’s order requiring the
    government to give 72 hours’ notice before transferring Doe to
    either Country A or Country B? Because the government gave
    notice of the proposed transfer to Country B, the government’s
    appeal of the notice order as it applies to Country B is now
    moot. With regard to Country A, the government has yet to
    come forward with any information about the circumstances of
    a prospective transfer to that country, including the specific
    purpose or interest that will give rise to the transfer. The
    government instead seeks ex-ante, carte-blanche authorization
    to transfer Doe to Country A, regardless of the particular
    circumstances or reasons, and without any opportunity for
    judicial review. We conclude that the district court did not err
    in denying the government that sort of blanket preapproval.
    While we sustain the district court’s orders, we do so
    respectful of—and with appreciation for—the considerable
    deference owed to the Executive’s judgments in the
    prosecution of a war. That latitude of course extends to
    military decisions about what to do with enemy combatants
    captured overseas in a zone of active hostilities. Virtually all
    such decisions will be unaffected by our decision today.
    But when an alleged enemy combatant—even one seized
    on a foreign battlefield—is an American citizen, things are
    different. See 
    Hamdi, 542 U.S. at 532-33
    , 535-37 (plurality);
    
    id. at 558-59
    (Scalia, J., dissenting). In that “surely . . . rare”
    6
    circumstance, 
    id. at 571
    n.3 (Scalia, J., dissenting), the
    Executive’s authority to wage war as it sees fit is cabined by
    the Supreme Court’s decision in Hamdi, which requires that a
    citizen be afforded certain guarantees before the military
    detains or transfers him under the law of war. 
    Id. at 517,
    533
    (plurality); 
    Omar, 646 F.3d at 24
    . That precedent, in our view,
    governs the disposition of this appeal.
    I.
    A.
    In September 2017, Syrian Democratic Forces
    encountered Doe at a screening point on an active battlefield in
    Syrian territory controlled by ISIL. Doe surrendered, informed
    the Syrian Democratic Forces that he was an American citizen,
    and asked to speak to U.S. officials. The Syrian Democratic
    Forces transferred Doe to the custody of U.S. military forces in
    the region. The military reached a preliminary determination
    that Doe is an enemy combatant, and has detained him at a U.S.
    facility in Iraq for the past seven months.
    The military’s preliminary determination that Doe is an
    enemy combatant is based on evidence that he is a member or
    substantial supporter of ISIL. The evidence against Doe
    includes the following: the circumstances of his surrender, his
    statements upon surrender and during detention, and records of
    his ISIL membership.
    ISIL, also known as the Islamic State of Iraq and Syria
    (ISIS), has been designated as a terrorist group. It controls
    territory in Iraq and Syria, and has perpetrated and aided
    terrorism there and around the world, killing several thousand
    civilians, including American aid workers and journalists. See
    U.S. Dep’t of State, Bureau of Counterterrorism, Country
    7
    Reports on Terrorism 2016:           Chapter 6, Terrorist
    Organizations (July 2017). Since September 2014, the United
    States has pursued a counterterrorism strategy against ISIL,
    and is an active member of a 75-country coalition working to
    defeat ISIL in Iraq and Syria.
    B.
    In October 2017, the American Civil Liberties Union
    Foundation, acting on Doe’s behalf, petitioned the district court
    for a writ of habeas corpus. The petition asserts that the
    military’s existing authority to engage in armed conflict does
    not extend to ISIL, that the military thus lacks legal authority
    to detain an alleged member of ISIL, and that, as a result, the
    government must either prosecute Doe in an Article III court or
    release him. In addition to those legal arguments, Doe
    contends as a factual matter that he is not an ISIL combatant.
    The district court determined that the ACLU had standing
    to bring the action on Doe’s behalf. The court ordered the
    government to give the ACLU access to Doe to ascertain
    whether he wanted to continue the action. Am. Civil Liberties
    Union Found. v. Mattis, 
    286 F. Supp. 3d 53
    , 60-61 (D.D.C.
    Dec. 23, 2017). On January 5, 2018, the ACLU informed the
    court that Doe wanted to continue pursuing the habeas petition
    with the ACLU representing him. The ACLU then asked for
    an order barring the government from transferring Doe to
    another country until the court decided the merits of his
    petition.
    On January 23, the district court granted Doe’s request in
    part. The court entered a preliminary injunction requiring the
    government to provide 72 hours’ notice before transferring Doe
    to any other country.
    8
    The court determined that Doe had proven a likelihood of
    success because the government had failed to demonstrate that
    it had the requisite legal authority to transfer him to another
    country. The court further concluded that Doe had shown
    irreparable injury, reasoning that transfer out of U.S. custody
    would render him “unable to pursue his habeas petition.” Doe
    v. Mattis, 
    288 F. Supp. 3d 195
    , 200 (D.D.C. Jan. 23, 2018).
    Finally, the court weighed the government’s interest in
    maintaining productive diplomatic relations with potential
    transferee countries against a U.S. citizen’s right to contest the
    lawfulness of his detention, concluding that both the balance of
    equities and the public interest favored Doe. Finding the
    requirements for a preliminary injunction to have been met, the
    court entered its order requiring 72 hours’ notice so that Doe
    would have an opportunity to challenge a proposed transfer
    before it happened.
    The government appealed. It initially asked this court to
    vacate the preliminary injunction so that it could transfer Doe
    to any country without providing advance notice. No. 18-5032,
    Gov’t Opening Br. 27-28. In the alternative, the government
    asked for vacatur of the notice requirement as applied to one
    specified country “or any other country that the Executive
    Branch determines has a legitimate interest in petitioner.” 
    Id. at 38.
    Later, in its reply brief, the government narrowed the
    scope of its appeal still further, such that it now seeks vacatur
    of the notice requirement only as applied to Countries A or B.
    No. 18-5032, Gov’t Reply Br. 2 n.1.
    On April 16, 2018, while the government’s appeal of the
    notice injunction was pending, the government filed a notice in
    the district court in compliance with that injunction. The notice
    communicated the government’s intent to transfer Doe to the
    custody of Country B in 72 hours. Attached to the notice was
    a sworn declaration from a Deputy Assistant Secretary of State,
    9
    who averred that Country B had expressed a “strong interest”
    in taking custody of Doe and continuing to detain him in some
    form. Doe v. Mattis, No. 17-cv-2069, Notice attach. 1 at 4-5
    (D.D.C. Apr. 17, 2018), ECF No. 80. Doe moved for a
    preliminary injunction or temporary restraining order to block
    the proposed transfer.
    On April 19, 2018, the district court granted the
    preliminary injunction, barring the government “from
    transferring [Doe] from U.S. custody.” Doe v. Mattis, No. 17-
    cv-2069, Prelim. Inj. (D.D.C. Apr. 19, 2018), ECF No. 88.
    While the order could be read to bar transfer to any foreign
    country, we understand it to grant only the relief Doe requested
    (and thus only the relief the government had notice might be
    imposed)—that is, a bar on transfer to Country B specifically.
    Cf. Capital City Gas Co. v. Phillips Petrol. Co., 
    373 F.2d 128
    ,
    131 (2d Cir. 1967). In support of the order, the court again
    concluded that Doe had demonstrated a likelihood of success
    on the merits because the government had failed to identify the
    requisite legal authority for a forcible transfer of Doe to
    Country B. And for the same reasons it gave when it entered
    the notice injunction, the court concluded that Doe would be
    irreparably injured absent an injunction and that the balance of
    equities and public interest weighed in his favor.
    The government appealed the second injunction to this
    court. It then moved for consolidation of the two appeals and
    expedited treatment, both of which we granted. This opinion
    thus resolves both of the government’s appeals. In view of the
    presumption of public access to judicial proceedings, we have
    endeavored to fashion the opinion so as to manage redactions
    while still not revealing the identities of Countries A and B.
    10
    II.
    The government appeals two orders granting injunctive
    relief to Doe: the order requiring the government to give 72
    hours’ notice before transferring Doe to Country A or B (the
    only countries as to which the government appeals the notice
    obligation); and the order prohibiting the government from
    transferring Doe to Country B. While both orders are
    denominated preliminary injunctions, the latter appears to
    function as a permanent injunction.
    A district court facing a request for a preliminary
    injunction must balance four factors: (i) whether the party
    seeking the injunction is likely to succeed on the merits of the
    action, (ii) whether the party is likely to suffer irreparable harm
    without an injunction, (iii) whether the balance of equities tips
    in the party’s favor, and (iv) whether an injunction would serve
    the public interest. Winter v. Nat. Res. Def. Council, Inc., 
    555 U.S. 7
    , 20 (2008). The same factors apply when a party seeks
    a permanent injunction, except the party must show “actual
    success” on the merits rather than just a likelihood. 
    Id. at 32.
    We review the district court’s balancing of those considerations
    for an abuse of discretion, but review any underlying legal
    conclusions de novo. Abdullah v. Obama, 
    753 F.3d 193
    ,
    197-98 (D.C. Cir. 2014).
    A.
    We first consider the order enjoining the Secretary from
    transferring Doe to Country B. We address each of the
    injunction factors in order.
    11
    1.
    In assessing whether Doe has succeeded on the merits, the
    relevant question is whether, in the circumstances of this case,
    involuntarily transferring Doe to Country B would be unlawful.
    We hold that it would be.
    The government makes two species of arguments as to
    why the Executive has the power to transfer Doe to Country B
    without his consent. The first rationale has no necessary
    connection to Doe’s designation as an enemy combatant, or
    even to the wartime context of this case. It instead relies on a
    general understanding that, when a foreign country wants to
    prosecute an American citizen already in its territory for a
    crime committed within its borders, the Executive can
    relinquish him to that country’s custody for criminal
    proceedings. The government’s second rationale, unlike the
    first, hinges on Doe’s status as an enemy combatant. That
    second strand of the argument relies on the military’s asserted
    authority under the law of war to transfer an enemy combatant
    (including an American citizen) to an allied country in the
    conflict.
    Neither of the government’s rationales, we conclude,
    supports the involuntary transfer of Doe to Country B, at least
    as things currently stand. In reaching that conclusion, we rely
    on the same undisputed facts as our dissenting colleague: that
    Doe is an American citizen, that he is in U.S. custody in Iraq,
    that the government believes he is an ISIL combatant, and that
    he objects to the government’s forcible transfer of him to the
    custody of Country B. Dissent, at 3-4, 27. While our colleague
    would conclude that the Executive can forcibly transfer Doe to
    Country B in those circumstances, we respectfully disagree for
    the reasons explained in this opinion.
    12
    a.
    A fundamental attribute of United States citizenship is a
    “right to . . . remain in this country” and “to return” after
    leaving. Mandoli v. Acheson, 
    344 U.S. 133
    , 139 (1952). That
    right is implicated when the government seeks to forcibly
    transfer an American citizen from the United States to a foreign
    country. To effect such a transfer, the government must both
    (i) demonstrate that a treaty or statute authorizes the transfer,
    and (ii) give the citizen an opportunity to challenge the factual
    basis for the transfer. Valentine v. United States ex rel.
    Neidecker, 
    299 U.S. 5
    , 9 (1936); Collins v. Loisel, 
    259 U.S. 309
    , 316-17 (1922).
    The government’s first argument in this case, though, is
    that a citizen loses both of those protections the instant he
    leaves U.S. territory. When a citizen sets foot outside the
    United States, the government says, the Executive can forcibly
    transfer him to the custody of any country having a “legitimate
    sovereign interest” in him. The transfer, the government
    emphasizes, would be “total.” No. 18-5110, Gov’t Second
    Supp. Br. 8. Following the citizen’s transfer, then, he would
    be fully—and irrevocably—subject to the power of the foreign
    sovereign now holding him.
    i. The government’s contention that it possesses that kind
    of transfer authority over an American citizen is centrally
    predicated on Munaf v. Geren, 
    553 U.S. 674
    , which is itself
    predicated on Wilson v. Girard, 
    354 U.S. 524
    . We disagree
    with the government’s understanding of those decisions.
    In Wilson, William Girard, a U.S. soldier stationed in
    Japan, was accused by Japan of committing a homicide in its
    
    territory. 354 U.S. at 525-26
    . The Army agreed to relinquish
    Girard to Japanese custody for pretrial detention. 
    Id. at 526.
                                    13
    Girard filed a habeas petition, and the district court issued a
    preliminary injunction prohibiting the transfer. 
    Id. The Supreme
    Court vacated the order and allowed the handover of
    Girard to Japanese custody.
    The Court began by recognizing that, as a general matter,
    a “sovereign nation has exclusive jurisdiction to punish
    offenses against its laws committed within its borders.” 
    Id. at 529.
    Japan had voluntarily surrendered that prerogative in a
    security agreement with the United States that governed the
    treatment of U.S. soldiers stationed in Japan. But the
    agreement permitted the United States to cede back to Japan
    the authority to prosecute a service member in a given instance.
    
    Id. at 527-29.
    In Girard’s case, the United States had done just
    that. 
    Id. at 529.
    So the question, the Court said, was whether
    there was any “constitutional or statutory barrier” to the
    Executive (i) waiving the United States’s jurisdiction and (ii)
    transferring Girard to Japan to face criminal prosecution. 
    Id. at 530.
    Finding no such barrier, the Court sanctioned Girard’s
    transfer to Japanese custody. 
    Id. In Munaf,
    the Court again applied the principle recognized
    in Wilson—i.e., that, when a foreign country wishes to
    prosecute an American citizen who is within its borders for a
    crime he committed while there, the Executive can relinquish
    him to the country’s custody. Munaf involved two American
    citizens who voluntarily traveled to Iraq and allegedly
    committed crimes while 
    there. 553 U.S. at 679
    . A
    multinational military coalition identified the two citizens as
    security risks, and they were held by U.S. military forces in Iraq
    “[p]ending their criminal prosecution for those offenses” in
    Iraqi courts. 
    Id. at 705;
    see 
    id. at 681,
    683. Both of the citizens
    filed habeas petitions, asserting (i) that the Executive lacked
    the power to transfer them to Iraq’s custody for criminal
    proceedings, and (ii) that transferring them thus would violate
    14
    the Due Process Clause. 
    Id. at 692.
    The Court rejected their
    arguments and allowed the military to relinquish them to Iraqi
    custody. 
    Id. at 705.
    Relying on Wilson, the Court emphasized that a country
    has a “sovereign right to ‘punish offenses against its laws
    committed within its borders.’” 
    Id. at 692
    (quoting 
    Wilson, 354 U.S. at 529
    ). That sovereign entitlement, the Court observed,
    was one that the Court had long and repeatedly recognized. 
    Id. at 694-95
    (citing, e.g., Schooner Exchange v, McFaddon, 11
    U.S. (7 Cranch) 116 (1812); Neely v. Henkel, 
    180 U.S. 109
    (1901); Kinsella v. Krueger, 
    351 U.S. 470
    (1956)). An order
    prohibiting the Executive from transferring the two petitioners
    to Iraqi authorities would infringe that time-honored 
    right. 553 U.S. at 697-98
    . The Executive thus could transfer the
    petitioners to Iraqi custody without violating the Due Process
    Clause. 
    Id. at 699-70.
    In both Munaf and Wilson, the authority of the Executive
    to transfer U.S. citizens had no roots in any military authority
    over enemy combatants under the law of war. Wilson, after all,
    concerned “the peacetime actions of a [U.S.] serviceman,” not
    the wartime actions of an enemy combatant. 
    Id. at 699.
    In
    Munaf, meanwhile, it is true that the alleged crimes involved
    insurgent acts committed in a time of war, for which both
    suspects had been designated “security internees” and one had
    been deemed an enemy combatant. See 
    id. at 681-84,
    705. But
    the Court’s recognition of the Executive’s power to transfer the
    two men did not depend on those designations or on the nature
    of the alleged crimes. That is evident from the Court’s heavy
    reliance on Wilson, a case having nothing to do with military
    authority in wartime.
    In accordance with that understanding, the Court in Munaf
    observed that “[t]hose who commit crimes within a sovereign’s
    15
    territory may be transferred to that sovereign’s government for
    prosecution” even if the “crime at issue” is an inherently non-
    war offense like “embezzlement.” 
    Id. at 699-700
    (discussing
    Neely v. Henkel, 
    180 U.S. 109
    (1901)). To be sure, “there is
    hardly an exception to that rule when the crime” is “unlawful
    insurgency directed against an ally during ongoing hostilities.”
    
    Id. at 700.
    So while the war-related context in which the crimes
    arose in Munaf was not a necessary condition for the Executive
    to possess the transfer authority recognized in Wilson, that
    context of course did not diminish the Executive’s authority.
    ii. In holding that the Executive had the power to transfer
    the Munaf petitioners, the Court distinguished its previous
    decision in Valentine v. United States ex rel. Neidecker, 
    299 U.S. 5
    . Because Doe chiefly relies on Valentine in arguing that
    the military lacks authority to transfer him to Country B,
    whereas the government centrally relies on Munaf in arguing
    the opposite, the Munaf Court’s treatment of Valentine
    warrants our careful examination.
    In Valentine, three American citizens fled to New York
    City after being accused by France of committing crimes
    within its territory. 
    Id. at 6.
    France requested the citizens’
    extradition, and U.S. officials arrested the three men. 
    Id. The men
    then filed habeas petitions, arguing that, because the
    extradition treaty between the United States and France
    contained no obligation for either country to hand over its own
    citizens, the Executive lacked the power to extradite them. 
    Id. The Court
    agreed, holding that the power to extradite “is not
    confided to the Executive in the absence of treaty or legislative
    provision.” 
    Id. at 8.
    Valentine thus establishes that the
    Executive’s power to extradite a citizen from the United States
    to another country must come from a treaty or statute. 
    Id. at 9;
    see 
    Munaf, 553 U.S. at 704
    .
    16
    Relying on Valentine, Doe contends that the Executive
    cannot transfer him from U.S. custody to another country’s
    custody unless the transfer is authorized by a treaty or statute.
    The petitioners in Munaf made the same argument in resisting
    their transfer to Iraqi custody. 
    Munaf, 553 U.S. at 704
    . The
    Court, though, found Valentine “readily distinguishable.” 
    Id. It explained
    that Valentine “involved the extradition of an
    individual from the United States.” 
    Id. The Munaf
    petitioners,
    by contrast, had “voluntarily traveled to Iraq and [were] being
    held there.” 
    Id. They were
    therefore “subject to the territorial
    jurisdiction of that sovereign, not of the United States.” 
    Id. The Court
    , for that reason, denied the contention that the
    Executive invariably “lacks the discretion to transfer a citizen
    absent a treaty or statute.” 
    Id. at 705.
    Wilson, the Court said,
    “forecloses” that contention. 
    Id. That is
    because the only
    conceivable authority in Wilson was the security agreement
    governing the treatment of U.S. service-members in Japan—
    which, while authorized by a treaty, was not itself a treaty or
    statute. 
    Id. “Nevertheless,” the
    Munaf Court observed, “in
    light of the background principle that Japan had a sovereign
    interest in prosecuting crimes committed within its borders,”
    the Wilson Court had “found no ‘constitutional or statutory’
    impediment to the United States’s waiver of its jurisdiction”
    over Girard and its ensuing transfer of him to Japanese custody.
    
    Id. iii. Because
    Munaf and Wilson recognized the Executive’s
    authority to transfer American citizens to foreign custody
    without having to satisfy Valentine’s treaty-or-statute rule, it is
    apparent that the Executive need not invariably meet the
    Valentine test to effect a forcible transfer. So some transfers of
    American citizens to foreign custody are governed by
    Valentine; others are not. Into which of those camps does the
    proposed transfer of Doe to Country B fall?
    17
    In arguing that it can forcibly transfer Doe, the government
    reads Valentine, Munaf, and Wilson to yield the following set
    of rules. Under Valentine, an American citizen in the United
    States cannot be forcibly transferred to a foreign country absent
    a statute or treaty (such as an extradition treaty) authorizing the
    transfer. But under Munaf and Wilson, the government says,
    once a citizen voluntarily leaves the United States, the
    Executive can pick her up and deliver her to any foreign
    country that has a “legitimate sovereign interest” in her.
    No. 18-5032, Gov’t Opening Br. 27; No. 18-5032, Gov’t Reply
    Br. 15; No. 18-5110, Gov’t Supp. Br. 5; No. 18-5110, Gov’t
    Second Supp. Br. 3. And a country’s interest in a person
    qualifies as “legitimate,” the government submits, if, under
    international law, the country would have “prescriptive
    jurisdiction” over her—that is, the power to prescribe legal
    rules regulating her pertinent conduct. No. 18-5032, Gov’t
    Opening Br. 23 (citing Restatement (Fourth) of the Foreign
    Relations Law of the United States § 211 (Am. Law Inst. Draft
    No. 2, 2016)); see also No. 18-5032, Gov’t Reply Br. 15; No.
    18-5110, Gov’t Supp. Br. 4-5; No. 18-5110, Gov’t Second
    Supp. Br. 4.
    We cannot accept the government’s submission. Munaf
    and Wilson do not suggest a general prerogative on the part of
    the Executive to seize any American citizen voluntarily
    traveling abroad for forcible transfer to any country with some
    legitimate sovereign interest in her. Consider again the facts of
    Valentine. There was no doubt of the legitimacy of France’s
    interest in the U.S.-citizen petitioners in that case: they had
    allegedly committed crimes in France. The Executive
    nonetheless lacked unilateral authority to “dispose of the[ir]
    liberty” by extraditing 
    them. 299 U.S. at 9
    . That is because,
    the Court said, there is generally “no executive discretion to
    surrender [a person] to a foreign government, unless . . . [a]
    statute or treaty confers the power.” 
    Id. 18 Under
    the government’s theory, though, everything would
    have changed the moment one of the Valentine petitioners
    voluntarily ventured outside the United States—say, on a
    family vacation to the Canadian side of Niagara Falls. At that
    moment, the unilateral “executive discretion” found lacking in
    Valentine ostensibly would have sprung to life, such that the
    person—though an American citizen—could have been seized
    by the Executive and forcibly transferred to France. Cf. United
    States v. Alvarez-Machain, 
    504 U.S. 655
    , 669-70 (1992)
    (involving the seizure in Mexico (of a non-U.S. citizen) for
    transfer to the United States).
    That expansive vision of unilateral Executive power over
    a U.S. citizen who ventures abroad does not follow from Munaf
    and Wilson. Those cases did not involve a citizen forcibly
    transferred from one foreign country they voluntarily visited to
    the custody of another foreign country. The cases instead
    involved “the transfer to a sovereign’s authority of an
    individual . . . already . . . in that sovereign’s territory.” 
    Munaf, 553 U.S. at 704
    . The petitioners in Munaf had “voluntarily
    traveled” to Iraq, 
    id. at 681,
    683, and the petitioner in Wilson,
    an Army specialist, was stationed in 
    Japan, 354 U.S. at 525-26
    .
    They were “therefore subject to the territorial jurisdiction of
    [those] sovereign[s], not of the United States.” 
    Munaf, 553 U.S. at 704
    . The petitioners in those cases, already present in
    the sovereign’s territory, could be relinquished by the
    Executive to that sovereign for prosecution of offenses
    allegedly committed while there.
    That transfer power, the Munaf Court explained, is
    grounded in the receiving country’s “territorial jurisdiction”
    over a person who has “voluntarily traveled” to its territory and
    is “being held there.” 
    Id. The government,
    though, reads
    Munaf and Wilson to embrace a transfer power extending to a
    receiving country’s “prescriptive jurisdiction,” not just its
    19
    territorial jurisdiction. E.g., No. 18-5032, Gov’t Opening Br.
    23. And a country’s prescriptive jurisdiction under customary
    international law, the government emphasizes, extends to any
    “individual with a ‘genuine connection’ to the state, even when
    the individual is located outside the state’s territory.” 
    Id. (emphasis added);
    see also Restatement (Fourth) of the Foreign
    Relations Law of the United States § 211 (Draft No. 2, 2016).
    The government is surely correct that a sovereign’s
    prescriptive jurisdiction—its power to regulate conduct—
    extends to persons located beyond its borders. The practice of
    extraditing individuals from abroad, and the existence of laws
    with extraterritorial reach, both illustrate the point. But the fact
    that a foreign country may have prescriptive jurisdiction over
    an American citizen who is outside its territory hardly means
    that, as long as the citizen is somewhere else abroad, the
    Executive has power to seize her and deliver her to that foreign
    country.
    Indeed, we know of no instance—in the history of the
    United States—in which the government has forcibly
    transferred an American citizen from one foreign country to
    another. (That includes the case of Amir Meshal, in which the
    government ardently denied a citizen’s allegations that foreign
    officials, who had moved him from Kenya, to Somalia, to
    Ethiopia, were acting at the United States’s behest. See Meshal
    v. Higgenbotham, 
    47 F. Supp. 3d 115
    , 119 (D.D.C. 2014),
    aff’d, 
    804 F.3d 417
    (D.C. Cir. 2015)). Especially in habeas
    cases like this one, “history matters.” 
    Omar, 646 F.3d at 19
    .
    To that end, the absence of even a single known example
    of the unilateral power the Executive claims here is
    illuminating. Indeed, we are unaware of any involuntary
    transfer of a U.S. citizen from one foreign country to another
    even pursuant to a treaty or statute. There is all the more
    20
    reason, then, to proceed with considerable caution before
    recognizing such a power as a unilateral (although apparently
    never-before-exercised) prerogative of the Executive.
    The implications of the government’s reading of Munaf
    and Wilson amplify the reasons to reject it. Consider, for
    example, a U.S. citizen who becomes a journalist, travels to
    Thailand for a multi-year assignment, and, on returning to the
    United States, writes articles critical of the Thai King that are
    alleged to play some role in sparking demonstrations in
    Thailand. Thailand might well argue that she falls within its
    prescriptive jurisdiction. And its arguments would have force
    if, for instance, she underpaid her Thai taxes while there, or her
    articles were deemed to have had a “substantial effect” within
    Thailand. See Restatement (Fourth) of the Foreign Relations
    Law of the United States §§ 211 & cmt. f, 213 (Draft No. 2,
    2016).
    If the government were right about Munaf and Wilson,
    then the moment the journalist stepped outside the United
    States, the Executive would have unilateral power to apprehend
    her and forcibly transfer her to Thailand if she were accused of
    violating Thai law. (Incidentally, there is a good reason to
    think the U.S.-Thai extradition treaty would not apply in that
    instance, given that it covers only “persons found in the
    territory of one of the Contracting Parties.” Extradition Treaty,
    U.S.-Thai., art. 1, Dec. 14, 1983, S. Treaty Doc. No. 98-16.)
    By the government’s logic, then, alleged breaches of the Thai
    tax code would authorize a forcible transfer. So too would
    alleged violations of Thailand’s lèse-majesté statute—under
    which anyone who “defames, insults, or threatens the [Thai]
    King . . . shall be punished with imprisonment of three to
    fifteen years.” Crim. Code B.E. 2499 § 112 (1956), amended
    by Crim. Code (No. 17), B.E. 2547 (2003) (Thai.); see Lese-
    Majeste Explained: How Thailand Forbids Insult of its
    21
    Royalty, BBC.com (Oct. 6, 2017) (discussing recent lèse-
    majesté prosecutions).
    We cannot accept that, if Thailand were to accuse the
    American journalist of underpaying taxes or penning articles
    critical of the King, the Executive would have unilateral power
    to apprehend and forcibly (and irrevocably) transfer her to Thai
    custody whenever she ventures outside the United States.
    Indeed, the implications of the government’s argument are
    more far reaching still. Imagine that the journalist is a dual
    citizen of the United States and Thailand. If so, Thailand would
    have prescriptive jurisdiction over her regardless of any
    violation of Thai law, because, like all sovereigns, it has an
    “interest in retaining control over its nationals and residents,
    wherever they may be.” Restatement (Fourth) of the Foreign
    Relations Law of the United States § 214 cmt. a (Draft No. 2,
    2016). Under the government’s theory, then, the Executive
    could forcibly transfer the journalist to Thai custody for any
    reason Thailand saw fit, including, say, that she would be a
    useful witness in a Thai trial. Cf. Blackmer v. United States,
    
    284 U.S. 421
    , 436-37 (1932).
    Thailand’s mere desire to have one of its citizens back
    cannot give the Executive the unilateral authority to forcibly
    transfer an American there, just because she steps outside the
    United States. After all, a dual citizen “is entitled to all the
    rights and privileges of [U.S.] citizenship.” Perkins v. Elg, 
    307 U.S. 325
    , 349 (1939). That includes the “right to return to and
    remain” in the United States after having left. 
    Mandoli, 344 U.S. at 139
    .
    To be sure, if Thailand asked the United States for help in
    delivering the journalist to its custody (Thailand presumably
    would be reluctant to seize a U.S. citizen on its own), the
    Executive could (and presumably would) decline to do so as a
    22
    matter of discretion. But the question for us is an antecedent
    one: whether, in the first place, the Executive would have the
    unilateral power to forcibly transfer an American citizen to
    another country merely because she travels abroad. We think
    the answer is no.
    The government emphasizes that, on the facts of this case,
    Doe is not just any citizen who traveled someplace abroad and
    is suspected of conduct like tax evasion. Rather, he went to an
    active battlefield; and Country B, a “coalition partner[] in an
    ongoing armed conflict” against ISIL, has, the government
    says, “an obvious and legitimate interest in taking custody of”
    him. No. 18-5032, Gov’t Reply Br. 6.
    Those circumstances, however, do not give the Executive
    transfer power under Munaf and Wilson that it would otherwise
    lack. Munaf and Wilson, as explained, do not rest on the
    military’s authority under the law of war. And we have
    declined to read those decisions to manifest a principle of
    prescriptive jurisdiction under which the Executive can
    forcibly transfer a U.S. citizen who has traveled abroad to any
    other country with a legitimate sovereign interest in her. That
    a country may have an especially important interest in a
    citizen—including by reason of her allegedly hostile actions
    against the country’s interests in a time of war—does not affect
    that conclusion.
    Does this mean that the military necessarily is without
    power in a time of war to transfer an enemy combatant who is
    a U.S. citizen to an allied country’s custody? No, it does not.
    It means that the authority to effect such a transfer does not
    come from the general transfer power recognized in Munaf and
    Wilson.     The authority instead would come from the
    Executive’s wartime powers under the law of war, a subject we
    turn to next.
    23
    b.
    The government, as noted, has said in this case that its
    “determination that [Doe] is an enemy combatant . . . is not the
    basis for the U.S. military’s authority to transfer” him to
    Country B. No. 18-5032, Gov’t Reply Br. 8. At the same time,
    though, the government has also said that “battlefield
    detainees” like Doe are “lawfully transferrable under the laws
    of war.” 
    Id. at 11;
    see also 
    id. at 13
    (“[P]etitioner’s status as a
    U.S. citizen imposes no special constraints on the U.S.
    military’s ability to transfer him consistent with the laws of
    war.”); No. 18-5110, Gov’t Second Supp. Br. 3 (arguing that
    transfer is permissible, in part because of “the Department of
    Defense’s good-faith determination . . . that [Doe] is an enemy
    combatant”).
    We now take up the latter facet of the government’s claim
    of authority to transfer Doe: that it can do so pursuant to the
    Executive’s wartime powers under the law of war. We
    conclude that the Executive does generally possess authority
    under the law of war to transfer an enemy combatant to the
    custody of an ally in the conflict. But that authority, we hold,
    could potentially support a transfer of Doe only if the
    government (i) demonstrates that it is legally authorized to use
    military force against ISIL, and (ii) affords Doe an adequate
    opportunity to challenge the Executive’s factual determination
    that he is an ISIL combatant.
    i. The starting point for our analysis is the Supreme
    Court’s decision in Hamdi v. Rumsfeld, 
    542 U.S. 507
    (2004).
    (Because the plurality in Hamdi issued the controlling opinion,
    which our court has treated as binding, see Al-Bihani v. Obama,
    
    590 F.3d 866
    , 872 (D.C. Cir. 2010), we will treat the plurality
    opinion as that of the Court for purposes of this opinion.)
    There, the Court spoke directly to the military’s authority over
    24
    an American citizen under the law of war. The case involved
    Yaser Esam Hamdi, who, like Doe, was captured on a foreign
    battlefield, where the government alleged he had fought with
    the Taliban against the United States. 
    Id. at 510,
    512-13.
    Hamdi, again like Doe, was a dual citizen of the United States
    and Saudi Arabia. See Man Held as Enemy Combatant to Be
    Freed Soon, CNN.com (Sept. 22, 2004.)
    The military initially detained Hamdi in Afghanistan and
    at Guantanamo Bay, and then, upon learning he was an
    American citizen, brought him to the United States for
    continued 
    detention. 542 U.S. at 510
    . Hamdi then filed a
    habeas petition seeking release from his military custody,
    alleging that his detention without criminal charge violated his
    rights under the Due Process Clause. 
    Id. at 511.
    The Court first held that the military had legal authority to
    detain Hamdi for the duration of the conflict in which he was
    captured. That power flowed from the 2001 Authorization for
    Use of Military Force (AUMF), Pub. L. No. 107-40, 115 Stat.
    
    224. 542 U.S. at 517
    . The 2001 AUMF authorized the
    President to “use all necessary and appropriate force against
    those nations, organizations, or persons [that] he determines
    planned, authorized, committed, or aided the terrorist attacks”
    of September 11, 2001. 
    Id. at 510
    (quoting 115 Stat. 224,
    § 2(a)). The Court found “no doubt” that Taliban combatants
    (like Hamdi was alleged to be) fit within that description. 
    Id. at 518.
    And the Court explained that detention of enemy
    combatants “for the duration of the particular conflict in which
    they were captured” is “so fundamental and accepted an
    incident to war as to be an exercise of the ‘necessary and
    appropriate force’ Congress ha[d] authorized the President to
    use.” 
    Id. 25 The
    Court next addressed whether Hamdi’s U.S.
    citizenship affected the Executive’s power to detain him. On
    that issue, the Court found “no bar to this Nation’s holding one
    of its own citizens as an enemy combatant.” 
    Id. at 519.
    After
    all, “[a] citizen, no less than an alien, can be part of or
    supporting forces hostile to the United States or coalition
    partners and engaged in an armed conflict against the United
    States.” 
    Id. (internal citation
    and quotation marks omitted).
    Finally, the Court turned to “the question of what process
    is constitutionally due to a citizen who disputes his enemy-
    combatant status.” 
    Id. at 524.
    The government argued that its
    determination to that effect should be subject to highly
    deferential review, solely to confirm the existence of some
    evidence supporting it. 
    Id. at 527.
    The government
    emphasized the “limited institutional capabilities of courts in
    matters of military decision-making in connection with an
    ongoing conflict.” 
    Id. The Court
    disagreed with the
    government.
    Because “due process demands some system for a citizen-
    detainee to refute his classification,” the Court explained, “the
    proposed ‘some evidence’ standard [was] inadequate.” 
    Id. at 537.
    Rather, “a citizen-detainee seeking to challenge his
    classification as an enemy combatant must receive notice of the
    factual basis for his classification, and a fair opportunity to
    rebut the Government’s factual assertions before a neutral
    decisionmaker.” 
    Id. at 533.
    That process, the Court observed,
    could potentially be afforded in a military proceeding. 
    Id. at 538.
    The Court also clarified, however, that “initial captures
    on the battlefield need not receive the process” the Court had
    outlined. 
    Id. at 534.
    Rather, that “process is due only when the
    determination is made to continue to hold” a combatant. 
    Id. 26 After
    Hamdi, we know that if there is legal authority to
    exercise military force against an enemy, that authority
    encompasses detention of an enemy combatant for the duration
    of the conflict. And we further know that the detention
    authority more generally extends to an enemy combatant who
    is an American citizen. But a citizen, Hamdi instructs, must
    have a meaningful opportunity to challenge the factual basis
    for his designation as an enemy combatant in accordance with
    the procedures set forth by the Court.
    ii. Whereas Hamdi addressed whether the Executive can
    detain an alleged enemy combatant who is a citizen, this case
    (at least at this stage) instead involves whether the Executive
    can transfer him to the custody of another country. That
    naturally raises two sets of questions. First, is the Executive’s
    transfer authority (this case) on par with its detention authority
    (Hamdi) as a fundamental incident of waging war? Second, if
    so, is the Executive’s exercise of transfer authority against a
    U.S. citizen subject to the same conditions attending the
    exercise of detention authority against a U.S. citizen? In other
    words, do transfer authority over citizens and detention
    authority over citizens essentially rise or fall together? We
    conclude they do.
    First, the military possesses settled wartime authority
    under the law of war to transfer enemy combatants to allied
    countries. That power, in the words of Hamdi, is “a
    fundamental incident of waging war,” such that the Executive
    generally has the authority to transfer when it has legal
    authorization to engage in hostilities. 
    Id. at 519.
    Congress confirmed as much in the National Defense
    Authorization Act (NDAA) for Fiscal Year 2012, Pub. L. No.
    112-81, 125 Stat. 1298 (Dec. 31, 2011). There, Congress
    elaborated on the authority conferred by the 2001 AUMF. It
    27
    affirmed that the AUMF grants detention authority pending
    decision of an enemy combatant’s “disposition under the law
    of war”; and it enumerated the available “dispositions” to
    include “[t]ransfer to the custody or control of the person’s
    country of origin, any other foreign country, or any other
    foreign entity.” 
    Id. § 1021(a),
    (c). Congress thus expressly
    considers transfer of an enemy combatant to be one option
    available to the military under the law of war. The Department
    of Defense’s directives are to the same effect. U.S. Dep’t of
    Def., Directive No. 2310.01E, § 3.m (May 24, 2017).
    That understanding is firmly rooted in historical practice.
    “Throughout the 20th Century, the United States transferred or
    released hundreds of thousands of wartime alien detainees—
    some of whom had been held in America—back to their home
    countries, or in some cases, to other nations.” Kiyemba v.
    Obama, 
    561 F.3d 509
    , 519-20 (D.C. Cir. 2009) (Kavanaugh,
    J., concurring). In World War I, for instance, the United States
    regularly transferred captured combatants to France, an ally.
    See George G. Lewis & John Mewha, History of Prisoner of
    War Utilization by the United States Army 1776-1945, Dep’t of
    the Army Pamphlet No. 20-213, at 59 (1955), available at
    https://cgsc.cdmhost.com. And in World War II, the United
    States transferred hundreds of thousands of Axis soldiers to
    allies like Belgium, France, and Luxembourg, where the
    soldiers were used as agricultural workers and underwent
    rehabilitation. 
    Id. at 240-41.
    Transfers to allies were also
    commonplace during the Vietnam and Gulf Wars. See George
    S. Prugh, Law at War: Vietnam 1964-1973, at 62 (1975); U.S.
    Dep’t of Def., Office of Gen. Counsel, Law of War Manual at
    633 n.742 (Dec. 2016). “Transfers,” in short, “are a traditional
    and lawful aspect of U.S. war efforts.” 
    Kiyemba, 561 F.3d at 519
    (Kavanaugh, J., concurring).
    28
    Even if transfers of alien combatants have been a regular
    feature of warfare, does the traditional authority to transfer
    enemy combatants extend to a U.S. citizen? On this score, the
    historical evidence is sparse. As noted, we know of no instance
    in which the Executive has forcibly transferred a citizen from
    one foreign country to another; and that includes wartime
    transfers of enemy combatants.
    Hamdi, however, instructs that a traditional military power
    over enemy combatants in wartime should generally be
    assumed to encompass American citizens. The Court reasoned
    that a citizen, “no less than an alien,” can be a part of an enemy
    
    force. 542 U.S. at 519
    . For that proposition, the Court relied
    on its decision in Ex parte Quirin, 
    317 U.S. 1
    (1942), in which
    it had upheld the military trial of a U.S. citizen for his unlawful
    belligerency in support of the enemy in World War II, 
    id. at 30-
    31.
    To be sure, Justice Scalia, dissenting in Hamdi, discounted
    Quirin as “not [the] Court’s finest 
    hour.” 542 U.S. at 569
    (Scalia, J., dissenting). He would have held that the military’s
    wartime authority over enemy combatants—including,
    presumably, transfer authority—does not extend to a U.S.
    citizen (at least absent a suspension of the writ by Congress).
    See 
    id. at 554.
    The Court, though, adhered to Quirin
    notwithstanding Justice Scalia’s critique. 
    Id. at 522-23.
    It thus
    found no reason to exclude U.S. citizens from the Executive’s
    fundamental authority under the law of war to detain enemy
    combatants for the duration of a conflict. 
    Id. at 519.
    Following
    the approach set out in Hamdi, we similarly see no basis for
    excluding a citizen—at least as a categorical matter—from the
    Executive’s wartime authority to transfer enemy combatants.
    Hamdi referenced a Ninth Circuit decision upholding the
    Executive’s power to detain, as a prisoner of war, a dual U.S.-
    29
    Italian citizen who was a member of the Italian forces in World
    War II. 
    Id. at 524
    (discussing In re Territo, 
    156 F.2d 142
    (9th
    Cir. 1946)); see also Ronald D. Rotunda, The Detainee Cases
    of 2004 and 2006 and Their Aftermath, 57 Syracuse L. Rev. 1,
    13 n.73 (discussing Territo’s dual citizenship). That decision
    also contemplated that he would be sent from the United States
    back to Italy at the war’s end. 
    See 156 F.2d at 144
    . True, that
    contemplated transfer would have been a “repatriation” to the
    enemy state, which, under the law of war, is distinct from a
    transfer to an ally (and which, presumably, would result in
    release rather than continued detention). Compare Geneva
    Convention (III) Relative to the Treatment of Prisoners of War,
    art. 12, Aug. 12, 1949, 6 U.S.T. 3316, with 
    id. at art.
    118. And
    Territo’s repatriation might well have been voluntary,
    especially given his family and other connections to Italy (he
    sought release from his detention in the U.S, and the opinion
    gives no indication that he wanted to stay here if released). 
    See 156 F.2d at 143
    . Still, Territo offers modest support for the
    conclusion that the Executive’s power to transfer under the law
    of war applies to both aliens and citizens. And Hamdi, again,
    teaches that both aliens and citizens may be subject to the
    Executive’s wartime authority.
    Second, having determined that the Executive has
    authority to transfer enemy combatants under the law of war,
    and that there is no blanket exemption from that power for U.S.
    citizens, we now assess whether Hamdi’s conditions on the
    exercise of detention authority equally govern any exercise of
    transfer authority. Those conditions, again, are that the
    Executive have legal authority to use military force against the
    relevant enemy (here, ISIL), and that the citizen be afforded the
    process laid out in Hamdi for challenging the factual
    determination that he is an enemy combatant.
    30
    In considering whether transfer should be subject to those
    conditions, an initial point bears noting: the transfer of a citizen
    to another country’s custody, unlike continued detention of that
    citizen, is irrevocable. Once the Executive relinquishes
    custody of an American citizen to another country, our
    government, and our laws—including our law’s habeas
    guarantee, which a detainee can use to seek relief from
    detention over time—would be unavailable to her, perhaps in
    perpetuity. Decisions about the duration and conditions of her
    custody, and about the availability to her of a means of
    challenging her confinement, would be entirely up to the
    detaining sovereign.
    The government asserts that, when we assess a potential
    transferee’s liberty interests, we cannot factor in her continued
    detention in the receiving country. That, the government says,
    follows from our holding in 
    Kiyemba. 561 F.3d at 515-16
    .
    Here, though, the central issue is not the prospect of continued
    detention in Country B, but rather the forcible transfer itself,
    which would involuntarily send an American citizen from U.S.
    custody to the custody of another country.
    In that regard, Kiyemba is starkly different; there, it was
    undisputed that the detainees had no cognizable interest against
    being moved from Guantanamo to a foreign country. (Indeed,
    because transfer was the only relief available to the
    petitioners—who, as aliens, had no right to be released into the
    United States—they affirmatively sought to be moved to a
    foreign country. 
    Id. at 519
    n.5 (Kavanaugh, J., concurring)).
    Here, by contrast, the transfer centrally implicates Doe’s
    interest in not being forcibly moved into Country B’s custody.
    Indeed, involuntary transfer of a citizen to the custody of
    another sovereign—including via extradition—undoubtedly
    involves fundamental liberty interests that can be vindicated in
    habeas corpus. E.g., 
    Valentine, 299 U.S. at 9
    (“no executive
    31
    prerogative to dispose of the liberty of the individual” by way
    of extradition); Landon v. Plasencia, 
    459 U.S. 21
    , 36 (1982).
    Cf. Sessions v. Dimaya, 
    138 S. Ct. 1204
    , 1213 (2018)
    (deportation from the United States can be viewed a more
    “severe penalty” for criminal misconduct than imprisonment in
    the United States).
    Given that transfers involve fundamental liberty interests,
    we see no basis for concluding that, for the transfer of a citizen
    (as opposed to the detention of a citizen), the Executive need
    not satisfy the Hamdi conditions. The 2012 NDAA is
    instructive in this regard. There, Congress set out four types of
    “disposition[s] under the law of war” that the Executive could
    choose for an enemy combatant, including “[d]etention under
    the law of war without trial until the end of the hostilities,” and
    “[t]ransfer to the custody or control of the person’s country of
    origin [or] any other foreign country.” Pub. L. No. 112-81
    § 1021(c)(1), (4). The statutory structure indicates that
    Congress saw transfer and detention as two options falling on
    largely the same plane—not as one option (transfer) broadly
    available in circumstances in which the other (detention) would
    not be.
    Significantly, our decisions draw an equivalence between
    transfer of citizens and detention of citizens. We have rejected
    the notion “that the Executive Branch may detain or transfer
    Americans or individuals in U.S. territory at will, without any
    judicial review of the positive legal authority for the detention
    or transfer.” 
    Omar, 646 F.3d at 24
    (emphases added). And we
    have said that “Congress cannot deny an American citizen or
    detainee in U.S. territory the ability to contest the positive legal
    authority (and in some situations, also the factual basis) for his
    detention or transfer unless Congress suspends the writ.” 
    Id. (emphasis added).
    For either “detention or transfer,” then, an
    32
    “American citizen” is entitled to challenge both “legal
    authority” and “factual basis,” as Hamdi envisions.
    The government reads the just-quoted language from our
    decision in Omar to say that an American citizen can bring a
    “legal authority” or “factual basis” challenge to her “detention
    or transfer” only if she is in the United States. See No. 18-5032,
    Gov’t Reply Br. 14. That is an unsustainable reading. Hamdi
    itself rejects the notion that it could “make a determinative
    constitutional difference” if an American citizen were detained
    overseas rather than in the United 
    States. 542 U.S. at 524
    . The
    Court understood that any such conclusion would “create[] a
    perverse incentive” to hold American citizens abroad. 
    Id. The Omar
    court’s reference to a challenge brought by “an
    American citizen or detainee in U.S. territory” thus plainly
    speaks to a challenge brought by a citizen anywhere or by an
    alien detained in U.S. territory (such as Guantanamo Bay).
    
    Omar, 646 F.3d at 24
    (citing Boumediene v. Bush, 
    553 U.S. 723
    , 785-86 (2008)); see also Al Bahlul v. United States, 
    767 F.3d 1
    , 65 n.3 (D.C. Cir. 2014) (Kavanaugh, J., concurring in
    the judgment in part and dissenting in part) (“As a general
    matter, the U.S. Constitution applies to U.S. citizens worldwide
    and to non-U.S. citizens within the 50 states and the District of
    Columbia[.]”). There is no basis for thinking that a citizen
    relinquishes her right to bring a legal challenge to her
    detention—or, equivalently, to her transfer—if she is detained
    in (or transferred from) a foreign country. That is why the court
    in Omar went on to explain that Omar (one of the two Munaf
    petitioners), who was still being held in Iraq, had the requisite
    opportunity to contest the legal authority for his transfer. 
    Id. That discussion
    would have been entirely unnecessary if he had
    no right to bring that challenge in the first place since he was
    held overseas.
    33
    Consider the implications if there were, in fact, an
    asymmetry between transfer and detention, such that the
    Executive could transfer a U.S. citizen to another country
    without meeting the Hamdi conditions. With regard to legal
    authority, the military could irrevocably transfer a citizen
    thought to be an enemy combatant even if judicial review
    would have revealed that the Executive lacked lawful authority
    to use military force against the particular enemy. In that event,
    detainees in U.S. custody—and thus protected by U.S. law—
    would need to be released or criminally charged. But for those
    who had already been transferred to another country, an
    American court could not order their return or grant them
    comparable relief.
    With regard to a factual-basis challenge, the Hamdi Court
    sought to “meet the goal of ensuring that the errant tourist,
    embedded journalist, or local aid worker has a chance to prove
    military 
    error.” 542 U.S. at 534
    . The procedural guarantees
    prescribed by the Court were intended to guard against an
    undue risk of an erroneous military determination. See 
    id. But if
    the transfer of a citizen could be accomplished without
    affording her those protections, a risk of error thought
    unacceptable for continued detention would be present for an
    irrevocable transfer to another country. An “errant tourist”
    might then be protected against detention but unable to avoid
    an irrevocable transfer to another country’s custody. Compare
    31A Am. Jur. 2d Extradition § 120 (2d ed. 2018) (describing
    process granted to persons subject to extradition); 18 U.S.C.
    § 3191.
    The government, in that respect, relies on its having made
    a “good-faith determination, supported by extensive record
    evidence, that [Doe] is an enemy combatant.” No. 18-5110,
    Gov’t Second Supp. Br. 3. We do not doubt the government’s
    good faith. Nor do we discount the importance of the need to
    34
    avoid unduly burdening the Executive’s prosecution of a war,
    which concerned the Hamdi Court as well. 
    See 542 U.S. at 531-35
    . But in Hamdi, one point on which eight Justices
    agreed was that, in the case of an American citizen, the
    government’s good-faith determination that he is an enemy
    combatant is not enough to justify his detention for the duration
    of a conflict. 
    Id. at 537;
    id. at 553 
    (Souter, J., concurring in
    part, dissenting in part, and concurring in the judgment); 
    id. at 564-65
    (Scalia, J., dissenting). We find the same to be true of
    an irrevocable transfer to another country’s custody.
    In that regard, it is instructive to consider the implications
    of the government’s argument here for the facts of Hamdi
    itself. Upon holding that the government’s continued detention
    of Hamdi was contingent on his having a meaningful
    opportunity to challenge the factual basis for his detention, the
    Court remanded the matter so that the government could
    conduct the factfinding process the Court had outlined. 
    See 542 U.S. at 538-39
    . That process would result in a
    determination of whether Hamdi was a person against whom
    military force could be applied.
    Under the government’s argument here, though, the
    Executive, rather than grant Hamdi that process following
    remand, could have simply avoided it by choosing instead to
    forcibly and irrevocably transfer him to the custody of another
    country (pursuant to its authority under the 2001 AUMF).
    True, the government eventually did in fact transfer Hamdi to
    Saudi Arabia—but with his consent, not over his objection (and
    after he renounced his American citizenship). Jerry Markon,
    Hamdi Returned to Saudi Arabia, Washington Post (Oct. 12,
    2004). There is, of course, a vast difference between a
    voluntary transfer and an involuntary one. As to the latter, we
    do not believe the Hamdi Court would have countenanced
    Hamdi’s forcible transfer to another country unless he were
    35
    first afforded the process the Court held he was constitutionally
    due.
    The government’s final argument on this score is that
    transfer without process is permissible if effected in
    conjunction with “initial capture[] on the battlefield.” No. 18-
    5110, Gov’t Supp. Br. 8-9 (quoting 
    Hamdi, 542 U.S. at 534
    ).
    But while Hamdi allows for temporary detention without
    process attending “initial capture,” a citizen can be released if
    there ends up being an insufficient factual basis to continue
    detention. Transfer may be different because it, by nature, is
    not temporary.
    In addition, there would be no citizenship-based limit on
    transfer unless there were reason to know that a person is a
    citizen. Cf. Asbury Aff. at 4, United States v. Lindh, No. Crim.
    02-MJ-51 (E.D. Va. Jan. 15, 2002) (“[Harakat ul-Mujahideen]
    officials told [John Walker Lindh] not to admit to anyone that
    he was American but to say, if asked, that he was from
    Ireland.”) Here, at any rate, the Executive decided to transfer
    Doe—and reached an agreement to do so—several months
    after his capture. Doe v. Mattis, No. 17-cv-2069, Notice at 1
    (D.D.C. Apr. 16, 2018), ECF No. 77; Status Hr’g Tr. at 8
    (D.D.C. Jan. 22, 2018), ECF No. 55 (stating that no final
    decision had been made on whether to transfer Doe). This
    transfer decision, then, was not a battlefield judgment. For
    those reasons, the Executive cannot transfer Doe at this stage
    unless he receives the process required by Hamdi.
    c.
    In light of the above analysis, can the Executive
    involuntarily transfer Doe to Country B? We conclude it
    cannot, at least as things stand now. We take up the two strands
    of the government’s argument in order.
    36
    i. We first address whether the Executive can forcibly
    transfer Doe to Country B based on the general transfer
    authority recognized in Munaf and Wilson. That authority, as
    we have explained, does not encompass the forcible transfer of
    a citizen from one foreign country to the custody of another
    foreign country. Insofar as the transfer of Doe to Country B
    would be an inter-country transfer, it falls outside of Munaf and
    Wilson.
    The government contends that the transfer nonetheless
    should be allowed because Doe is a dual citizen of the United
    States and Country B (Saudi Arabia). As a result, the
    government emphasizes, Country B has an especially strong
    interest in accepting custody over Doe: the interest in
    repatriating one of its own nationals in order to attempt to
    rehabilitate him consistent with its own laws and practices.
    To that end, the government notes that a country always
    has prescriptive jurisdiction over its own nationals, including
    when they are abroad. See No. 18-5032, Sealed Gov’t Opening
    Br. 23 (citing Restatement (Fourth) of the Foreign Relations
    Law of the United States § 214 & cmt. a (Draft No. 2, 2016));
    No. 18-5032, Sealed Gov’t Reply Br. 15; No. 18-5110, Sealed
    Gov’t Supp. Br. 4; No. 18-5110, Sealed Gov’t Second Supp.
    Br. 4. And by carrying out the transfer, the government urges,
    the United States also would further its own interest in
    maintaining constructive relations with an ally in the military
    efforts against ISIL (which would, among other benefits, allow
    for productive discussions with Country B about the transfer of
    additional combatants in the future). See No. 18-5032, Gov’t
    Opening Br. 24.
    We do not doubt the weight of Country B’s sovereign
    interests in (and prescriptive jurisdiction over) Doe based on
    all of those considerations, including, in particular, his Saudi
    37
    citizenship. Nor do we question the Executive’s assessment of
    Country B’s interests. See 
    Kiyemba, 561 F.3d at 515
    . But the
    strength of Country B’s interests in Doe as a Saudi citizen does
    not diminish the force of Doe’s rights as a U.S. citizen: here,
    the right to resist the Executive’s forcible seizure and transfer
    of him to the custody of another country. After all, “dual
    citizenship presupposes rights of citizenship in each country.”
    Kawakita v. United States, 
    343 U.S. 717
    , 725 (1952); see 
    Elg, 307 U.S. at 345
    . And the limits on unilateral Executive
    authority ultimately “protect the individual.” Bond v. United
    States, 
    564 U.S. 211
    , 222 (2011).
    Recall, for instance, the example introduced earlier based
    on the facts of Valentine: while Valentine held that the
    Executive lacked unilateral authority to extradite the
    petitioners to France, the Executive, under the government’s
    theory, would have gained that authority the moment one of the
    petitioners stepped across the border into Canada.
    Now imagine that the same petitioner had been a dual
    U.S.-French citizen. True, his French citizenship would have
    fortified France’s sovereign interests in him (which were
    already substantial given his alleged commission of crimes in
    France). But his U.S. citizenship still would have meant that
    the Executive could not extradite him to France from the
    United States. See 
    Valentine, 299 U.S. at 10-13
    . And it still
    would be anomalous to suppose that the Executive gained the
    ability to transfer him merely because he set foot in Canada.
    Doe’s dual citizenship, in short, does not affect our
    conclusion that the transfer authority recognized in Munaf and
    Wilson is inapplicable in this case.
    ii. We now turn to whether the forcible transfer of Doe to
    Country B can be supported by the Executive’s wartime
    38
    authority over enemy combatants under the law of war. That
    authority, as we have explained, encompasses transfers of
    enemy combatants to an allied country. But before the
    Executive could exercise that transfer power against Doe, the
    two Hamdi conditions would need to be met.
    The first condition is a determination that the Executive
    has legal authority to wage war against ISIL. “For wartime
    military transfers,” we have said, “Article II and the relevant
    Authorization to Use Military Force generally give the
    Executive legal authority to transfer.” 
    Omar, 646 F.3d at 24
    .
    Second, Doe would need to be afforded a meaningful chance
    to rebut the government’s factual assertion that he is an ISIL
    combatant, per the requirements set out in Hamdi.
    Neither condition has been met at this point. Until those
    conditions are satisfied, the Executive lacks power under the
    law of war to transfer Doe to Country B on the basis of his
    status as an alleged ISIL combatant.
    2.
    Having addressed Doe’s success on the merits of his claim
    that a forcible transfer to Country B would be unlawful, we
    now consider whether he has shown he would be irreparably
    injured absent the injunction. See 
    Winter, 555 U.S. at 20
    . We
    conclude he has made that showing.
    A forcible transfer of Doe to the custody of Country B, the
    government explains, would be “bona fide and total,” in that
    “[o]nce transfer is effectuated,” he “would be entirely in
    [Country B’s] custody,” without any continuing oversight by—
    or recourse to—the United States. No. 18-5032, Gov’t Reply
    Br. 15. Doe, wishing to avoid that irrevocable change in his
    station, objects to his proposed transfer to the custody of
    39
    Country B. No more is required to demonstrate that he would
    face irreparable injury if he were involuntarily (and
    irreversibly) handed over to Country B in violation of his
    constitutional rights.
    In contending that Doe fails to establish irreparable injury,
    the government observes that the point of a habeas petition is
    to obtain release from U.S. custody. And if the planned transfer
    of Doe to Country B goes forward, the government observes,
    he would no longer be in U.S. custody. So transfer, the
    government says, is thus tantamount to release, and there can
    be no “irreparable harm from obtaining the very relief his
    habeas action seeks to obtain.” No. 18-5110, Gov’t Supp. Br.
    10.
    The government’s position cannot be correct. It would
    mean that any habeas petitioner objecting to a planned
    extradition of him would be unable to demonstrate irreparable
    injury if he were extradited. We know that is not the case. See
    Belbacha v. Bush, 
    520 F.3d 452
    , 456 (D.C. Cir. 2008)
    (collecting cases granting stays of extradition); Demjanjuk v.
    Meese, 
    784 F.2d 1114
    , 1118 (D.C. Cir. 1986) (“extradition of
    petitioner to Israel may qualify as a threat of irreparable
    harm”); see also Nken v. Holder, 
    556 U.S. 418
    , 434-35 (2009)
    (noting “irreparable nature of harm from removal before
    decision on a petition for review”). Of course, a transfer to a
    foreign country’s custody necessarily ends U.S. custody; but
    the transfer itself is a harm that cannot be remedied.
    The government similarly observes that, if Doe were
    released from his U.S. custody in Iraq, he would likely be
    detained by Iraq. Or, the government says, he might be seized
    in Iraq by another country. As a result, the government
    contends, there would be a limited practical difference between
    40
    the release sought by Doe and a transfer to another country.
    No. 18-5110, Gov’t Supp. Br. 10-11.
    That argument again proves too much. As to the first
    point, if detention in Iraq were equivalent to detention in
    another country for purposes of irreparable injury, then a
    citizen who could lawfully be transferred to one country could
    never secure an injunction prohibiting his ensuing transfer to
    any other country. By the government’s logic, once the Munaf
    Court blessed the petitioners’ transfer to Iraq, they would have
    been categorically precluded from getting an injunction barring
    their transfer to Albania, Zambia, or any country in between.
    As to the second point, once a petitioner is released, he could
    conceivably be seized by any country. So if the mere
    possibility of apprehension by a country meant that a petitioner
    would not be harmed by transfer there, then courts could never
    enjoin a transfer to any country on the globe. That is not the
    law.
    3.
    When a private party seeks injunctive relief against the
    government, the final two injunction factors—the balance of
    equities and the public interest—generally call for weighing the
    benefits to the private party from obtaining an injunction
    against the harms to the government and the public from being
    enjoined. See Pursuing America’s Greatness v. FEC, 
    831 F.3d 500
    , 511 (D.C. Cir. 2016). We find the balance to tip in Doe’s
    favor.
    The equities at stake on both sides are manifestly weighty
    ones. The government seeks to avoid undue interference with
    its military judgments in connection with ongoing hostilities
    and with its conduct of foreign relations with a coalition partner
    in that campaign. Doe, meanwhile, seeks to vindicate his rights
    41
    as an American citizen to avoid a forcible and irrevocable
    transfer to (potentially indefinite) custody at the hands of a
    foreign sovereign.
    As the Supreme Court observed in Hamdi, a citizen’s
    “interest in being free from physical detention” is the “most
    elemental of liberty 
    interests.” 542 U.S. at 529
    . The Court
    therefore denied the Executive the ability to continue detaining
    an alleged enemy combatant in wartime unless it afforded him
    procedural protections the Court thought he was
    constitutionally owed. And the Court did so despite the
    government’s belief that affording additional process would be
    unnecessary and unworkable. See 
    id. at 525.
    Here, we
    conclude an injunction barring Doe’s forcible transfer to
    Country B’s custody is warranted for substantially similar
    reasons and in substantially similar circumstances.
    B.
    The government also appeals the district court’s order
    requiring it to give 72 hours’ notice before transferring Doe to
    either Country A or Country B. With regard to Country B, the
    government gave the district court the requisite notice before
    attempting to effect an agreed-upon transfer. When a
    defendant complies with an injunction in that fashion, its
    appeal of the injunction becomes moot. See People for the
    Ethical Treatment of Animals, Inc. v. Gittens, 
    396 F.3d 416
    ,
    421 (D.C. Cir. 2005). At any rate, now that we have sustained
    the injunction barring Doe’s transfer to Country B, any
    requirement to give advance notice of such a transfer is beside
    the point.
    The notice requirement still presents an ongoing
    controversy with regard to Country A, however. An order
    requiring the government to give advance notice before
    42
    transferring a detainee to another country cannot be sustained
    if there could be no grounds for enjoining the transfer. See
    
    Kiyemba, 561 F.3d at 514
    . The government relies on that
    principle here, contending that any transfer of Doe to Country
    A invariably would be lawful. We are unpersuaded.
    As an initial matter, we note that, because of the way this
    case developed, Doe did not have a meaningful opportunity to
    address a potential transfer to Country A. In the government’s
    opening brief, it made three alternative requests for relief: (i)
    vacatur of the injunction in its entirety, (ii) vacatur of the
    injunction as applied to any “country that the Executive Branch
    determines has a legitimate interest” in Doe, or (iii) vacatur as
    applied only to one specified country. See No. 18-5032, Gov’t
    Opening Br. 38. Indeed, the government’s opening brief noted
    the possibility of transferring Doe to Country A only in passing
    in a footnote. 
    Id. at 31
    n.5. Such a reference is ordinarily
    inadequate to preserve an argument. See CTS Corp. v. EPA,
    
    759 F.3d 52
    , 64 (D.C. Cir. 2014). And while the government
    specifically included Country A as a possible transferee
    country in its reply brief, that was too late. See 
    Abdullah, 753 F.3d at 199-200
    .
    The lateness of the government’s suggestion that it might
    wish to transfer Doe to Country A is magnified, because, on the
    existing record, we know very little about what such a transfer
    would entail. Unlike with Country B, with whom the
    government has reached an agreement to transfer Doe, we are
    aware of no concrete plans in the works (or on the horizon) to
    transfer Doe to Country A. Indeed, the government has not
    submitted a single affidavit or declaration discussing a transfer
    of Doe to Country A, the reasons that might give rise to an
    agreement to transfer Doe there, the terms or expectations
    surrounding such a transfer, or the anticipated conditions of his
    custody after that transfer. The government has listed at a high
    43
    level of generality some possible interests Country A could
    have in mind if it were to accept custody of Doe. See No. 18-
    5032, Gov’t Reply Br. 8-9. But even with regard to that array
    of potential interests, we do not know whether a transfer of Doe
    would occur only for those reasons.
    The government thus essentially seeks blanket
    preapproval to transfer Doe to Country A, regardless of the
    reasons or circumstances. We decline to recognize that sort of
    carte-blanche license in the present circumstances. In Munaf,
    the Supreme Court upheld the transfer of the two habeas
    petitioners to Iraq’s custody, but only after examining the
    reasons for the proposed transfers and the governing law. See
    
    Omar, 646 F.3d at 24
    . Here, the government asks for an all-
    purpose preapproval without any opportunity to assess a
    particular transfer before it takes place. Particular transfers to
    Country A may or may not be unlawful depending on the
    circumstances. The notice requirement secures the ability to
    make that assessment at a suitable time.
    In these circumstances, we cannot set aside the notice
    requirement as to Country A. In terms of likelihood of success
    on the merits, with notice of the possibility of a transfer to
    Country A and at least some factual information about what
    such a transfer might entail, Doe would have had an
    opportunity to show that a particular transfer to Country A
    would be unlawful. With regard to irreparable injury, a
    particular transfer arrangement, depending on the
    circumstances, could irrevocably injure his interests, and Doe
    did not have an opportunity to address in his briefing the
    potential harm he would suffer if transferred to Country A.
    And the remaining injunction factors could favor Doe in the
    context of a concrete transfer proposal.
    44
    None of this is to say that, in the end, Doe necessarily will
    be able to show that any agreed-upon transfer to Country A
    (Iraq) is unlawful. He may or may not be able to do so,
    depending on considerations such as: (i) whether, given the
    way Doe came to be in Iraq, his presence there qualifies as
    “voluntar[y],” 
    Munaf, 553 U.S. at 704
    , and (ii) whether the
    reasons for an agreed-upon transfer should bring the case
    within Munaf’s rule allowing transfers of citizens already
    within a country’s borders. At this point, without any
    information about an agreed-about transfer, we decline to set
    aside the notice requirement with regard to Country A.
    *   *    *   *    *
    We affirm the district court’s injunction barring the
    government from transferring Doe to Country B, and we also
    affirm the district court’s injunction requiring the government
    to give 72 hours’ notice before transferring him to Country A.
    Our disposition will constrain the government’s ability to
    transfer an American citizen believed to be an enemy
    combatant more than the government would like. That is an
    important consideration in this case in light of the deference
    owed to military judgments in wartime. But “such cases,”—
    i.e., those in which “a United States citizen [is] captured in a
    foreign combat zone”—“must surely be rare.” 
    Hamdi, 542 U.S. at 571
    n.3 (Scalia, J., dissenting) (formatting altered).
    In those rare cases, the constraints on the Executive could,
    in theory, discourage the Executive from taking custody of a
    suspected enemy combatant known to be an American citizen.
    That was equally true, though, of the Supreme Court’s decision
    in Hamdi, which established constraints on the Executive’s
    treatment of U.S. citizens captured on a foreign battlefield. We
    45
    adhere to that decision and apply it to military transfers,
    consistent with our precedent. See 
    Omar, 646 F.3d at 24
    .
    The Hamdi Court believed it “unlikely” that its decision
    would have a “dire impact on the central functions of
    
    warmaking.” 542 U.S. at 534
    . At the same time, the Court
    thought it “vital” that it “not give short shrift to the values that
    this country holds dear or to the privilege that is American
    citizenship.” 
    Id. at 532;
    see 
    id. at 558-59
    (Scalia, J.,
    dissenting). We follow the Court’s guidance today.
    It is so ordered.
    KAREN LECRAFT HENDERSON, Circuit Judge, dissenting:
    A reader, having just reviewed the majority opinion, might well
    be thinking it declares a lead-pipe result. Caveat lector. The
    opinion treats all but silently the judiciary’s dispositively
    downsized role in the theater of war. See Al Bahlul v. United
    States, 
    792 F.3d 1
    , 28 (D.C. Cir. 2015) (Henderson, J.,
    dissenting) (in the “thicket” of international politics and
    “waging war,” “our lack of competence is marked,” “our
    democratic unaccountability glaring” and “the ramifications of
    our actions unpredictable” (internal quotation, citations and
    ellipses omitted)), judgment vacated upon grant of reh’g en
    banc (Sept. 25, 2015). The majority affirms a preliminary
    injunction (Order) that ventures well beyond the district court’s
    limited authority. The Order blocks our military from
    transferring a battlefield captive, petitioner John Doe, to a
    country that has a sovereign interest in him based on his
    citizenship there. 1 The district court does not find—because
    there is no evidence—that Doe will be mistreated if transferred.
    Instead, the point of the Order is to ensure that Doe can
    challenge his custody in the hope of winning release therefrom
    on his own terms. The Order is without precedent: in Munaf
    v. Geren, 
    553 U.S. 674
    (2008), the United States Supreme
    Court vacated the only comparable injunction. And worse
    than the Order’s novelty is its effect: it disrupts military
    operations and sovereign-to-sovereign relations half a world
    away.
    1
    This case involves materials that have been sealed to protect
    sensitive diplomatic interests. Consistent with the “presumption of
    openness in judicial proceedings,” United States v. Microsoft Corp.,
    
    56 F.3d 1448
    , 1464 (D.C. Cir. 1995) (per curiam) (internal quotation
    omitted), I rely on the public portion of the briefs and record where
    possible. Where not possible, I rely on sealed information—mainly
    in footnotes—and redact it from the public version hereof.
    2
    Affirmance portends a hazardous expansion of the
    judiciary’s role in matters of war and diplomacy. In defending
    the Order, Doe relies on Hamdi v. Rumsfeld, 
    542 U.S. 507
    (2004), by which a habeas court reviews the lawfulness of a
    U.S. citizen’s extended military detention. But Hamdi does
    not empower a court to enjoin our military from transferring a
    battlefield captive not facing extended detention. Much less
    does it authorize injunctive relief where, as here, the receiving
    country has a facially strong interest in the captive and the
    Executive Branch has determined in good faith that he is an
    enemy combatant. Habeas is concerned with Executive
    Branch “custody,” 28 U.S.C. § 2241(c), not relinquishment of
    it. Doe erroneously blurs the distinction. He claims that the
    Executive cannot relinquish custody absent authority to
    maintain it or, alternatively, absent the “positive legal
    authority” of an extradition treaty. I discern no such
    requirement in Hamdi or any other precedent Doe cites.
    Further, I believe the Order is at odds with Munaf. There,
    the Supreme Court vacated a preliminary injunction that
    blocked our military from transferring to Iraqi custody an
    American citizen determined by military officers—without
    Hamdi’s judicial review—to be an enemy combatant. I see no
    reason for a different result here: the facts are closely analogous
    and the comity and separation of powers considerations that
    animated Munaf apply with similar force. If that were not
    sufficient to align this case with Munaf, our own decision in
    Kiyemba v. Obama, 
    561 F.3d 509
    (D.C. Cir. 2009) (Kiyemba
    II), bridges any gap.
    I would vacate the Order. It is valid only if Doe shows
    that all of the preliminary injunction factors support the district
    court’s intrusion into Executive Branch affairs. In my view,
    Doe has not carried his burden. Because my colleagues
    conclude otherwise, I respectfully dissent.
    3
    I. BACKGROUND
    The majority opinion recounts many of the relevant facts
    and much of the procedural history. I include my own
    recitation to complete the picture and to amplify points that I
    think distance this case from Hamdi and bring it within
    Munaf’s ambit. I draw the bulk of the recitation from the
    government’s factual return. Public Appendix (App.) 155-
    309; see 28 U.S.C. § 2243 (habeas court may require custodian
    to “make a return certifying the true cause of the detention”);
    Order, Dkt. No. 41 at 1 (Jan. 12, 2018) (court required return).
    Doe claims in passing that “the government’s allegations
    are riddled with inaccuracies” and “are fundamentally
    misleading.” Appellee’s Br. 24 n.3. Yet he does not give us
    his own factual account, except to say that terrorists
    “kidnapped and imprisoned” him while he was in Syria seeking
    to “understand” and “report about” the conflict there. 
    Id. Otherwise, he
    accepts the government’s allegations for the
    purpose of litigating its authority to detain him. And in his
    view, the government’s authority to detain him is all but
    coextensive with its discretion to transfer him. Make no
    mistake, he is wrong about that. When read together, Hamdi
    and Munaf make plain that a putative transferee like Doe is not
    on the same legal footing as a detainee the military has decided
    to “continue to hold” indefinitely. 
    Hamdi, 542 U.S. at 534
    (emphasis altered). Still, given Doe’s view of the purported
    overlap—and because he reserves his right to challenge the
    government’s allegations only at “a later stage,” Pet’r’s Resp.
    to Factual Return, Dkt. No. 59 at 1 (Feb. 9, 2018)—I would
    hold him to his stance regarding the government’s authority to
    detain him and its discretion to transfer him.
    To me, then, it does not matter that Doe baldly “contends
    that he is not in fact an [ISIS] combatant.” Maj. Op. 2. His
    4
    pro forma assertion is contrary to all evidence of record. For
    our purpose today, he was found in a foreign war zone during
    active hostilities and he admitted training with and working for
    a terrorist organization. Accordingly, for our purpose today,
    he is on far different ground from a tourist, tax evader or
    political dissident. Maj. Op. 4, 18, 20-22.
    A. DOE’S BACKGROUND, ISIS MEMBERSHIP AND CAPTURE
    Doe is a citizen of Saudi Arabia. He is also a citizen of
    the United States but has not lived here since 2006 and has not
    visited since 2014. 2
    In July 2014, Doe voluntarily traveled to Syria to join the
    Islamic State of Iraq and the Levant, a terrorist organization
    better known as ISIS. ISIS has committed
    systematic abuses of human rights and
    violations of international law, including
    indiscriminate killing and deliberate targeting
    of civilians, mass executions and extrajudicial
    killings, persecution of individuals and entire
    communities on the basis of their identity,
    kidnapping of civilians, forced displacement of
    Shia communities and minority groups, killing
    and maiming of children, rape and other forms
    2
    Doe was born in the United States. When he was ten years
    old, he moved to Saudi Arabia and became a citizen there. He
    returned to the United States for college but moved back to Saudi
    Arabia two years later. Before taking up with ISIS, Doe owned
    businesses in Saudi Arabia, got married there and fathered a daughter
    there. Members of his extended family still live there.
    5
    of sexual violence, along with numerous other
    atrocities.
    Dep’t of State, The Global Coalition to Defeat ISIS (Sept. 10,
    2014), perma.cc/W9ZV-Y4DV. 3 The United States and 74
    other countries have committed to defeating ISIS through
    military force and other means. Id.; see Dep’t of State, The
    Global Coalition to Defeat ISIS: Partners (Sept. 10, 2014),
    perma.cc/SQ57-GQ7R. 4
    Starting in or about March 2015, Doe attended ISIS
    training in Syria with fellow recruits. At the training site, he
    swore allegiance to Abu Hafs al-Maghrebi, who acted on
    behalf of ISIS’s leader, Abu Bakr al-Baghdadi. ISIS assigned
    Doe to be a fighter in the Zarqawi Brigade, a military unit that
    “guard[ed] the front lines” in Syria. App. 195. There, Doe
    procured fuel for ISIS vehicles, handled funds for ISIS
    expenses and performed other administrative tasks. He was
    later assigned to guard the gate of an ISIS oil field and then to
    monitor personnel who worked on ISIS’s heavy equipment.
    Doe worked for ISIS for about two and one-half years
    “until air strikes and other military offensives against [ISIS]
    forced him to flee.” App. 162. On or about September 11,
    3
    ISIS has committed many such acts in Saudi Arabia. See,
    e.g., Dep’t of State, Country Reports on Terrorism 2016, 219-20
    (July 2017) (Country Reports), perma.cc/Q2J9-LPCX.
    4
    Saudi Arabia has been “a key member and active participant”
    in this coalition. Country 
    Reports, supra, at 219
    . It has, for
    example, joined the United States in launching military strikes
    against ISIS targets. Dep’t of Defense, U.S., Saudi Arabia Conduct
    Airstrikes Against ISIL in Syria (Oct. 13, 2014), perma.cc/3YEF-
    RET3.
    6
    2017, Syrian Democratic Forces captured him on an active
    battlefield as he tried to escape Syria into Turkey. He was
    carrying thumb drives that contained ISIS personnel
    spreadsheets as well as “military style handbooks” about
    techniques for interrogation, handling weapons and building
    bombs. App. 199-200. Doe told his captors he had been
    walking for two days. ISIS controlled all of the territory
    within a two-day walk. Doe’s physical appearance was
    “typical of an [ISIS] devotee.” App. 245. And, indeed, he
    expressly identified himself as “daesh,” another name for ISIS.
    
    Id. Claiming American
    citizenship, he said he “wanted to
    speak to the Americans” and “turn himself in.” 
    Id. Because Doe
    claimed American citizenship, the Syrian
    Democratic Forces transferred him “to U.S. forces stationed in
    Iraq,” App. 161, within the same theater of combat as his
    capture, Public Oral Arg. Tr. 18-19, 31 (Apr. 5, 2018).
    According to the factual return, “[t]he Government had not set
    out to capture” him but has since “worked diligently to
    investigate [him] . . . and determine an appropriate disposition
    of him.” App. 161. During custodial interrogation, Doe
    admitted that he attended ISIS training and “became an active
    member of ISIS.” App. 262-63. Based on those admissions
    and other facts, the Executive Branch has concluded that he is
    an enemy combatant.
    B. DISTRICT COURT PROCEEDINGS
    Doe was in United States custody by September 12, 2017.
    On September 14, the Defense Department confirmed a news
    report that it had a citizen in custody abroad. Betsy Woodruff
    & Spencer Ackerman, U.S. Military: American Fighting for
    ISIS “Surrenders,” DAILY BEAST (Sept. 14, 2017),
    thebea.st/2x1RfeZ.
    7
    On October 5, 2017—i.e., 23 days after our Armed Forces
    took custody of Doe—the American Civil Liberties Union
    Foundation (ACLUF) filed a petition for writ of habeas corpus
    as his next friend. The petition, which remains pending in
    district court, claims that Doe’s custody at the hands of the
    United States military is “[u]nauthorized and [u]nlawful.”
    App. 19. It asks the court to order the government to “charge
    [Doe] with a federal criminal offense in an Article III court or
    release him.” App. 23.
    On December 23, 2017, the district court ordered the
    government to give the ACLUF “immediate and unmonitored
    access” to Doe. App. 39. In the same order, the court
    prohibited the government from transferring Doe until the
    ACLUF informed the court whether Doe wanted the ACLUF
    “to continue this action on his behalf.” 
    Id. The government
    complied with the order and the ACLUF spoke with Doe by
    videoconference. Doe confirmed that he wanted to pursue the
    habeas case with the ACLUF as his counsel.
    On January 5, 2018, Doe sought “interim relief”
    prohibiting the government from transferring him “until the
    Court issues a final judgment on his habeas petition.” Pet’r’s
    Mot. for Continued Interim Relief, Dkt. No. 32 at 2. He
    argued that such relief was necessary “to prevent the United
    States from pretermitting this habeas action while the Court
    considers the lawfulness of his detention.” 
    Id. at 3
    n.4. He
    disclaimed then—and has not alleged since—that he will be
    mistreated if transferred. Less than two weeks later, the
    district court prohibited any transfer pending its ruling on
    Doe’s motion for interim relief. Then, on January 23, the
    court ordered the government to provide the court and counsel
    72 hours’ notice before transferring Doe, “at which time [he]
    may file an emergency motion contesting his transfer.” App.
    50.
    8
    On April 16, 2018—pending an expedited appeal of the
    notice requirement and after “extensive diplomatic
    discussions” with the receiving country—the government
    notified the district court and counsel of its intent to transfer
    Doe. 5 Resp’t’s Notice, Dkt. No. 80-1 at 7 (redacted version). 6
    On April 18, Doe sought a preliminary injunction blocking the
    transfer. He renewed his contention that the government
    “should not be allowed to pretermit [his] habeas action seeking
    his release from unlawful detention by forcibly transferring
    him.” Mot. for Prelim. Inj., Dkt. No. 82-1 at 2 (redacted
    version).
    On April 19, 2018, in the Order sub judice, the district
    court granted Doe’s motion for a preliminary injunction. The
    Order prohibits the government “from transferring [Doe] from
    U.S. custody” absent “further order” of the district court.
    Prelim. Inj., Dkt. No. 88. Explaining its Order, the court
    recognized that Doe had to show “[1] he is likely to succeed on
    the merits, [2] he is likely to suffer irreparable harm in the
    5
    The government intends to transfer Doe to Saudi Arabia,
    which has “an interest in returning its citizens to Saudi custody.”
    Sealed Appendix 166. In past negotiations, Saudi Arabia has
    pursued that interest and the United States has honored it, to the
    benefit of both countries. 
    Id. (returning Saudi
    citizens to Saudi
    Arabia “has been a significant benefit to the United States in
    combatting terrorism”); see, e.g., Dep’t of Defense, Detainee
    Transfers Announced (Jan. 5, 2017) (noting transfer of four detainees
    from Guantanamo Bay to Saudi Arabia), perma.cc/5CRP-74K8.
    6
    I agree that, because the government satisfied the notice
    requirement as to the proposed transfer to Saudi Arabia, the validity
    of the requirement as to that transfer is moot. Maj. Op. 41. And
    because I would permit the government to effectuate the transfer to
    Saudi Arabia, I do not address whether the notice requirement is
    valid as to any other country.
    9
    absence of preliminary relief, [3] the balance of equities tips in
    his favor, and [4] an injunction is in the public interest.” Mem.
    Op., Dkt. No. 91-1 at 2 (unsealed Apr. 23, 2018) (quoting
    Winter v. NRDC, 
    555 U.S. 7
    , 20 (2008)) (ellipses omitted).
    The court concluded that Doe meets all four requirements. In
    the court’s view:
    •   Doe is likely to succeed on the merits because the
    government is required to, and has failed to, “present
    positive legal authority for his transfer.” Mem. Op. 3
    (internal quotation omitted).
    •   Doe will suffer irreparable harm absent the Order
    because, upon transfer to another country, he “will lose
    his constitutional right to contest his detention in a U.S.
    court.” 
    Id. at 5.
    •   The equities favor blocking the transfer because “the
    potential harm to bilateral relations between the United
    States and its strategic ally does not outweigh [Doe’s]
    constitutional right to seek habeas relief.” 
    Id. at 6.
    •   Similarly, the public interest favors blocking the
    transfer because the government’s military and
    diplomatic interests do not override “citizens’ rights to
    contest the lawfulness of their detentions and transfers.”
    
    Id. II. ANALYSIS
    A preliminary injunction is a “drastic remedy” to be
    granted only if the movant makes a “clear showing” that he is
    entitled to it. Mazurek v. Armstrong, 
    520 U.S. 968
    , 972 (1997)
    (per curiam) (internal quotation omitted). To my mind, Doe
    does not come close.
    10
    A. LIKELIHOOD OF SUCCESS
    As a threshold matter, Doe misunderstands his burden.
    He says “the government . . . must show” his transfer will be
    “lawful.” Appellee’s Br. 14 (emphasis added). He adds that,
    in deciding whether the government has made that showing, we
    cannot “accept[] as true” the allegations in the factual return.
    
    Id. And he
    suggests the government must possess foursquare
    “precedent for the proposition that it may transfer a U.S. citizen
    to the custody of a foreign sovereign without positive legal
    authority.” Appellee’s Suppl. Br. 5. Doe’s contentions
    erroneously treat a preliminary injunction as the baseline.
    Such relief is “the exception,” not “the rule.” 
    Munaf, 553 U.S. at 690
    . Because it is “extraordinary”—especially where, as
    here, it disrupts core functions of a coequal branch of
    government—“it is never awarded as of right.” 
    Id. at 689-90
    (internal quotation omitted). It is Doe who must justify the
    Order, relying on precedent that can bear its weight.
    We also have every reason at this stage to accept the
    government’s factual allegations. To the extent Doe’s
    likelihood of success depends on his being a wayward
    bystander kidnapped in ISIS territory, see Appellee’s Br. 23-24
    n.3, it is incumbent on him as the moving party to support that
    story with evidence and to explain why the government’s
    contrary account is inaccurate, see 13 JAMES WM. MOORE ET
    AL., MOORE’S FEDERAL PRACTICE § 65.23[2] (3d ed. 2012)
    (“Submission of affidavits in support of a motion for a
    preliminary injunction is customary.”). Granted, Doe has
    reserved the right to challenge the government’s account at “a
    later stage.” Pet’r’s Resp. to Factual Return 1. But for now
    he provides no “clear evidence”—indeed, no evidence at all—
    to rebut the “presumption of regularity” we accord military
    assertions like the ones contained in the return. Latif v.
    11
    Obama, 
    677 F.3d 1175
    , 1178 (D.C. Cir. 2012) (internal
    quotation omitted).
    With Doe’s burden in mind, I turn to the leading cases and
    their application vel non here.
    1. Law of detention and transfer
    Relying heavily on Hamdi, Doe argues that the Executive
    Branch cannot transfer him absent “positive legal authority” or
    ex ante judicial review of the military’s determination that he
    is an enemy combatant. The government argues that, under
    Munaf and Kiyemba II, principles of comity and separation of
    powers prevent the district court from blocking Doe’s transfer.
    I agree with the government.
    a. Extended detention in Hamdi
    Yaser Hamdi, an American citizen, allegedly took up arms
    with the Taliban before September 11, 2001 and remained with
    his unit afterward. 
    Hamdi, 542 U.S. at 512-13
    (plurality
    opinion). Later in 2001, a coalition of our allies captured him
    in an active combat zone in Afghanistan. 
    Id. at 510,
    514, 516.
    They transferred him to the United States military, which in
    turn sent him to Guantanamo Bay and later to stateside naval
    brigs. 
    Id. at 510
    . More than six months after Hamdi’s
    capture on the battlefield, his father filed a habeas petition as
    his next friend. 
    Id. at 511.
    With no apparent intention of
    transferring him to another country, the government claimed
    the authority to detain him indefinitely as an enemy combatant.
    
    Id. at 510
    .
    Faced with that claim of authority—to detain Hamdi
    without charge “for the duration of the particular conflict in
    which [he was] 
    captured,” 542 U.S. at 518
    —the Supreme Court
    agreed that a 2001 congressional enactment supplied the
    12
    authority if Hamdi was in fact an enemy combatant, 
    id. at 516-
    24. The Court turned, then, to “the question of what process
    is constitutionally due to a citizen who disputes his enemy-
    combatant status.” 
    Id. at 524.
    Balancing the competing
    interests under Mathews v. Eldridge, 
    424 U.S. 319
    (1976), the
    Court concluded “that a citizen-detainee seeking to challenge
    his classification as an enemy combatant must receive notice
    of the factual basis for his classification, and a fair opportunity
    to rebut the Government’s factual assertions before a neutral
    decisionmaker,” 
    Hamdi, 542 U.S. at 533
    ; see 
    id. at 527-35.
    Importantly, however, the Court emphasized “that initial
    captures on the battlefield need not receive the process we have
    discussed” and that such “process is due only when the
    determination is made to continue to hold those who have been
    
    seized.” 542 U.S. at 534
    (emphasis altered). Moreover, the
    Court repeatedly made plain that its due process analysis
    applies only to detention. See, e.g., 
    id. at 509
    (concluding that
    “citizen held in the United States” must “be given a meaningful
    opportunity to contest . . . that detention”); 
    id. at 524
    (focusing
    on procedures attendant to “detention of enemy combatants”);
    
    id. at 525
    (examining relief “available to [an] individual
    detained within the United States”); 
    id. at 529
    (weighing
    “interest in being free from physical detention by one’s own
    government”); 
    id. at 530
    (considering “interest of the
    erroneously detained individual” (emphasis omitted)); 
    id. at 535
    (referring to “protections that accompany challenges to
    detentions”); cf. 
    id. at 519
    (discussing authority for
    “detention”); 
    id. at 523
    (finding “authority to detain” enemy
    combatant). The Court’s analysis mentioned the concept of
    sovereign-to-sovereign transfer only once and only in passing.
    
    Id. at 518-19.
    Even then, it equated transfer with repatriation
    or release, not continued detention. 
    Id. (noting that
    “object of
    capture is to prevent the captured individual from serving the
    enemy” until he is “exchanged, repatriated or otherwise
    13
    released” (quoting In re Territo, 
    156 F.2d 142
    , 145 (9th Cir.
    1946))).
    b. Transfer in Munaf
    Acting under a United Nations resolution, a coalition force
    of 26 countries took Shawqi Omar and Mohammad Munaf into
    military custody for their “serious hostile acts” in Iraq.
    
    Munaf, 553 U.S. at 699
    ; see 
    id. at 679,
    681, 684. I focus here
    on Omar. He was a citizen of the United States and Jordan.
    
    Id. at 681.
    He was “believed to have provided aid to” al
    Qaeda. 
    Id. He was
    held in Iraq “in the immediate physical
    custody of American soldiers.” 
    Id. at 685
    (internal quotation
    omitted). A tribunal of three American military officers
    concluded that he was an enemy combatant. 
    Id. at 681.
    A
    coalition review board reached the same conclusion. 
    Id. at 682.
    The coalition later “decided to refer” Omar to Iraqi
    criminal court “for criminal proceedings.” 
    Id. Members of
    Omar’s family filed a habeas petition on his
    behalf. Omar v. Harvey, 
    479 F.3d 1
    , 4 (D.C. Cir. 2007).
    They asserted that Omar was an “innocent civilian[] . . .
    unlawfully detained by the United States in violation of the Due
    Process Clause.” 
    Munaf, 553 U.S. at 692
    . As here, the
    United States decided to relinquish custody to another country.
    
    Omar, 479 F.3d at 3
    . As here, the district court “issued a
    preliminary injunction barring transfer in order to preserve its
    jurisdiction to entertain the habeas petition.” 
    Id. As here,
    no
    criminal charges were pending in the receiving country when
    the court issued the preliminary injunction. 
    Id. at 8.
    As here,
    this Court upheld the preliminary injunction on the theory that
    it “properly preserve[d]” the district court’s jurisdiction “to test
    the lawfulness of . . . extrajudicial detention.” 
    Id. at 8,
    15.
    The Supreme Court vacated this Court’s decision and the
    preliminary injunction itself. 
    Munaf, 553 U.S. at 705
    . I
    14
    recognize that the Supreme Court’s holding was narrow: the
    Court concluded that district courts cannot “exercise their
    habeas jurisdiction to enjoin our Armed Forces from
    transferring individuals detained within another sovereign’s
    territory to that sovereign’s government for criminal
    prosecution.” 
    Id. at 689.
    But the Court’s reasoning swept
    more broadly. Because it weighs heavily against the Order
    here, I discuss it in detail.
    The Court observed that, “at its core,” habeas is directed at
    “unlawful executive detention,” the “typical remedy” for which
    is 
    “release.” 553 U.S. at 693
    . In the Court’s view, the
    atypical remedy of blocking Omar’s transfer to Iraq was “not
    appropriate.” 
    Id. The Court
    emphasized that habeas “is
    governed by equitable principles,” which means that
    “prudential concerns, such as comity and the orderly
    administration of criminal justice, may require a federal court
    to forgo the exercise of its habeas corpus power.” 
    Id. (internal citation
    and quotations omitted). And the Court concluded
    that comity—specifically, respect for Iraq’s sovereign interest
    in prosecuting crimes committed within Iraq’s borders, even by
    citizens of the United States—prevented the district court from
    enjoining Omar’s transfer. 
    Id. at 694
    (“Iraq has a sovereign
    right to prosecute Omar and Munaf for crimes committed on
    its soil.”); see 
    id. at 705
    (invoking Wilson v. Girard, 
    354 U.S. 524
    (1957) (per curiam), for “background principle” that
    foreign country has “sovereign interest in prosecuting crimes
    committed within its borders”); 
    id. at 692,
    694-99 (same).
    In a passage my colleagues downplay, the Court found
    further support for its conclusion in separation of powers
    principles.   Even in peacetime, the Court noted, “the
    Constitution allows the Executive to transfer American citizens
    to foreign authorities for criminal 
    prosecution.” 553 U.S. at 699
    . The Court remarked on how “strange” it would be “to
    15
    hold that the Executive lacks that same authority where, as
    here, the detainees were captured by our Armed Forces for
    engaging in serious hostile acts against an ally in what the
    Government refers to as ‘an active theater of combat.’” 
    Id. at 699-700
    . “Such a conclusion,” the Court cautioned, “would
    implicate . . . concerns about unwarranted judicial intrusion
    into the Executive’s ability to conduct military operations
    abroad.” 
    Id. at 700.
    Finally, the Court rejected Omar’s contention that “the
    Government may not transfer a citizen” to another country
    “without legal authority” in the form of “a treaty or 
    statute.” 553 U.S. at 704
    (internal quotations and brackets omitted).
    Omar had relied on Valentine v. United States ex rel.
    Neidecker, 
    299 U.S. 5
    (1936), which the Court found “readily
    distinguishable” because “[i]t involved the extradition of an
    individual from the United 
    States.” 553 U.S. at 704
    . The
    Court acknowledged that, in the context of extradition from the
    territorial United States, the government cannot “‘seize [a
    fugitive criminal] and surrender him to a foreign power’”
    absent authority conferred by “a pertinent constitutional or
    legislative provision.” Id. (quoting 
    Valentine, 299 U.S. at 9
    ).
    “But Omar . . . voluntarily traveled to Iraq” and was “captured
    and already detained” there. 
    Id. Because he
    was not within
    the territorial jurisdiction of the United States, Valentine was
    inapposite. 
    Id. c. Transfer
    in Kiymeba II
    The district court in the Kiyemba litigation required the
    government to provide 30 days’ notice to the court and counsel
    before transferring nine Uighurs from Guantanamo Bay to any
    “country where they might be tortured or further detained.”
    Kiyemba 
    II, 561 F.3d at 511
    . In this Court, the Uighurs
    defended the district court’s order as essential “to protect[ing]
    16
    the court’s jurisdiction over their underlying claims of unlawful
    detention.” 
    Id. at 513
    n.3. Treating the order as a preliminary
    injunction, this Court vacated it because the Uighurs did not
    “make the required showing of a likelihood of success on the
    merits.” 
    Id. at 516.
    Even “assum[ing] arguendo these alien detainees have the
    same constitutional rights with respect to their proposed
    transfer as did the U.S. citizens facing transfer in 
    Munaf,” 561 F.3d at 514
    n.4, this Court held that “Munaf precludes the
    district court from barring the transfer of a Guantanamo
    detainee on the ground that he is likely to be tortured or subject
    to further prosecution or detention in the recipient country,” 
    id. at 516.
    The Court accepted the government’s representation
    that “any prosecution or detention the petitioners might face
    would be effected ‘by the foreign government pursuant to its
    own laws and not on behalf of the United States.’” 
    Id. at 515
    (quoting declaration of Defense Department official). And
    the Court reasoned that, under Munaf, “comity and respect for
    foreign sovereigns . . . bar[] a court from issuing a writ of
    habeas corpus to shield a detainee from prosecution and
    detention by another sovereign according to its laws.” 
    Id. (internal quotation
    omitted).
    Taking a further cue from Munaf, the Court added that
    “separation of powers principles” “preclude the courts from
    second-guessing” the Executive Branch with respect to
    
    transfer. 561 F.3d at 515
    . The Court concluded that the
    district court’s notice requirement alone—even without regard
    to potentially blocking the transfer itself—unduly “interfere[d]
    with the Executive’s ability to conduct the sensitive diplomatic
    negotiations required to arrange safe transfers for detainees.”
    
    Id. 17 2.
    Application to Doe’s transfer
    Under the foregoing framework, Doe has not shown—in
    fact, cannot show—that he will likely succeed on the merits.
    a. As Judge Brown recognized in Omar, “we must first
    [ask] in what sense” a putative transferee “must be likely to
    
    succeed.” 479 F.3d at 18
    (Brown, J., dissenting in part). The
    Supreme Court answered that question in Munaf: we look to
    whether he will likely succeed on “the merits of [his] habeas
    
    petition.” 553 U.S. at 690
    .
    Here, Doe’s habeas petition challenges his detention at the
    hands of the Executive Branch. App. 11 (alleging that Doe is
    “being unlawfully detained by the United States military”);
    App. 13 (stating that Secretary of Defense “is detaining [Doe]
    under or by color of the authority of the United States”); App.
    17 (claiming that detention violates 18 U.S.C. § 4001(a), which
    applies to “citizen . . . imprisoned or otherwise detained by the
    United States”); App. 20 (challenging “detention . . . by
    Respondent”). Doe therefore cannot succeed on the merits of
    his habeas petition unless he remains “detained by the United
    States.” App. 17 (quoting section 4001(a)). And he will not
    remain detained by the United States if the district court has
    improperly blocked the government from relinquishing
    custody to Saudi Arabia.
    b. To repeat, habeas “at its core” is aimed at “unlawful
    executive detention,” not at a transfer that ends it. 
    Munaf, 553 U.S. at 693
    . Accordingly, if it is ever “appropriate,” as a
    matter of “equitable principles,” to enjoin a captive’s transfer
    from Executive Branch custody simply to allow him to
    challenge that soon-to-be-erstwhile custody, such relief ought
    to be reserved for the most “extreme case” of Executive Branch
    malfeasance. 
    Id. at 693,
    702 (internal quotation omitted); see,
    e.g., 
    id. at 702
    (suggesting relief might be warranted if “the
    18
    Executive has determined that a detainee is likely to be tortured
    but decides to transfer him anyway”). Doe’s case is by no
    means extreme in that sense. Indeed, it tracks Munaf in two
    crucial respects.
    First, as in Munaf, the receiving country here has a facially
    strong—for that matter, all but undisputed—interest in the
    transfer.7 Granted, the particular interest here is slightly different
    from that in Munaf. There, the Court relied on Iraq’s
    “sovereign right to prosecute Omar and Munaf for crimes
    committed on its soil.” 
    Id. at 694
    . Here, by contrast, Doe did
    not (as far as the record discloses) commit crimes within the
    receiving country’s territory and he has not (to date) been
    charged with any offense there. But the difference in the two
    cases is not as stark as Doe would have it: recall that Omar had
    not been charged with a crime in Iraq before the district court
    issued the preliminary injunction, or even before this Court
    issued a decision. Compare Appellee’s Br. 31 (attempting to
    distinguish Omar’s case on basis that Iraq “was actively
    prosecuting” him), with 
    Omar, 479 F.3d at 8
    (noting that
    “Omar has not been charged with a crime related to the
    allegations now lodged against him”). More to the point,
    focusing on a receiving country’s interest in prosecuting
    territorial offenses misses the ocean for the boat: in the habeas
    context, comity is why the prosecutorial interest matters.
    
    Munaf, 553 U.S. at 693
    (“Habeas corpus is governed by
    7
    Doe does not dispute that he is a citizen of Saudi Arabia and
    has spent much of his life there. See supra note 2. Nor does he
    dispute that the Saudi government has an interest in repatriating its
    citizens, including radicalized ISIS-affiliated citizens who are
    detained abroad and are candidates for rehabilitation. See supra
    notes 3-5; see also            Decl. ¶¶ 2-3 (Apr. 16, 2018) (detailing
    Saudi interest in repatriation and rehabilitation); Country 
    Reports, supra, at 222
    (same).
    19
    equitable principles,” including “prudential concerns . . . such
    as comity.” (internal quotations omitted)); see 
    id. at 698-99
    (relying on “principles of comity and respect for foreign
    sovereigns” (quoting 
    Omar, 479 F.3d at 17
    (Brown, J.,
    dissenting in part))).
    Comity is “[c]ourtesy” towards “the laws and usages” of
    another nation. III OXFORD ENGLISH DICTIONARY 539 (2d ed.
    1989). By definition, it counsels “mutual recognition of
    legislative, executive, and judicial acts” that go well beyond
    prosecutorial prerogatives. BLACK’S LAW DICTIONARY 324
    (10th ed. 2014). In some cases, then, comity weighs against
    blocking a captive’s transfer even if the receiving country
    claims no immediate interest in prosecuting him for a territorial
    offense.
    Perhaps the most obvious case is one like Doe’s, in which
    the captive is a citizen of the receiving country. Customary
    international law recognizes a state’s “sovereign[] interest in
    retaining control over its nationals and residents, wherever they
    may be.”         RESTATEMENT (FOURTH) OF THE FOREIGN
    RELATIONS LAW OF THE UNITED STATES § 214 cmt. a (2016
    draft); see 
    id. § 211
    cmt. c (state has jurisdiction over “conduct
    occurring on the state’s territory or being committed by or
    against its nationals” (emphasis added)); see also Blackmer v.
    United States, 
    284 U.S. 421
    , 437 n.2 (1932) (under
    international law, state has “jurisdiction over its subjects
    travelling or residing abroad, since they remain under its
    personal supremacy” (internal quotation omitted)).
    In any event, Kiyemba II demonstrates that the availability
    of habeas relief does not depend on whether the putative
    transferee will be prosecuted by the receiving state. This
    Court held that “Munaf precludes the district court from barring
    the transfer of a Guantanamo detainee on the ground that he is
    20
    likely to be tortured or subject to further prosecution or
    detention in the recipient country.” 8 Kiyemba 
    II, 561 F.3d at 516
    (emphasis added).
    Second, the separation of powers considerations
    highlighted in Munaf also apply here. When “‘adjudicating
    issues inevitably entangled in the conduct of our international
    relations,’” a court is “to proceed ‘with . . . circumspection.’”
    
    Munaf, 553 U.S. at 689
    (quoting Romero v. Int’l Terminal
    Operating Co., 
    358 U.S. 354
    , 383 (1959)). Far from
    circumspect, the Order upends the Executive Branch’s decision
    to relinquish Doe to a country the district court acknowledges
    is a “strategic ally.” Mem. Op. 6. Much as in Munaf, the
    Executive’s decision was informed by the ally’s sovereign
    interest in Doe and by our military’s good-faith determination
    that he committed “serious hostile acts” in “an active theater of
    combat” where he was captured and remains detained. 9 
    Munaf, 553 U.S. at 699
    -700; see generally App. 155-309 (factual
    return). Thus, the Order is every bit the “judicial intrusion”
    into “military operations” and “sensitive diplomatic
    negotiations” that the preliminary injunctions in Munaf and
    8
    Doe tries to distinguish Kiyemba II on the ground that the
    Uighurs were non-citizens. It is a fair point but goes only so far; the
    Court “assume[d] arguendo” the Uighurs had “the same
    constitutional rights with respect to their proposed transfer as did the
    U.S. citizens facing transfer in 
    Munaf.” 561 F.3d at 514
    n.4.
    9
    At oral argument, Doe contended that the record contains
    evidence only that the determination was made, not that it was made
    in good faith. Because there is no evidence that the determination
    was made in bad faith, however, I see no reason to question the
    government’s motives. Cf. 
    Latif, 677 F.3d at 1178-85
    .
    21
    Kiyemba II were. 
    Munaf, 553 U.S. at 700
    ; Kiyemba 
    II, 561 F.3d at 515
    .
    c. Doe argues that Hamdi justifies the intrusion. He
    contends that, absent an applicable extradition treaty,
    Appellee’s Suppl. Br. 10; see infra pp. 23-27, the government
    cannot transfer him unless it “can lawfully detain [him] as an
    enemy combatant in the first place,” Appellee’s Br. 23. It
    follows, in his view, that the district court can appropriately
    block his transfer in order to review the government’s
    “unilateral and untested assertion” that he is a detainable
    enemy combatant. 
    Id. To hold
    otherwise, he says, would
    wrongly deprive him of the due process protections to which
    Hamdi entitles him.
    I disagree. For starters, the Supreme Court in Munaf did
    not read Hamdi the way Doe does. Omar was merely “alleged
    to have committed hostile or warlike acts in 
    Iraq.” 553 U.S. at 679
    (emphasis added); see 
    id. at 694
    (he was “alleged to have
    committed serious crimes in Iraq” (emphasis added)). Based
    on those alleged hostile acts, military authorities decided that
    Omar was an enemy combatant. 
    Id. at 681-82.
    The Court did
    not hold that a federal judge had to review that determination
    as a prerequisite to transfer, whether as a matter of “positive
    legal authority” or due process. To the contrary, the Court
    concluded that it was “not appropriate” to block Omar’s
    transfer for the sake of ensuring he could litigate, via habeas,
    his claim that he was an “innocent civilian[] . . . unlawfully
    detained by the United States in violation of the Due Process
    Clause.” 
    Id. at 692
    -93.
    Notably, the Court in Munaf cited Hamdi only once, for
    the proposition that “[h]abeas is at its core a remedy for
    unlawful executive 
    detention.” 553 U.S. at 693
    (emphasis
    added). Conversely, as mentioned above, the Court in Hamdi
    22
    invoked the concept of sovereign-to-sovereign transfer only
    once, equating it with repatriation or release rather than
    
    detention. 542 U.S. at 518-19
    . Reading the cases together, I
    can only conclude that detention and transfer are not flipsides
    of the same coin but two entirely different currencies. Hamdi,
    in short, does not apply to Doe’s transfer. It is a case about
    detention potentially “for the duration of the relevant
    hostilities.” 
    Id. at 519.
    To reiterate, the Court excepted
    “initial captures on the battlefield” from “the process we have
    discussed,” emphasizing that such “process is due only when
    the determination is made to continue to hold those who have
    been seized.” 
    Id. at 534
    (emphasis altered); see 
    id. at 529
    (Hamdi’s “liberty interest[]” was “in being free from physical
    detention by [his] own government”).
    Nevertheless, according to Doe, wherever one draws the
    line between battlefield captive and long-term detainee, he falls
    on the latter side. In his telling, this case involves an
    Executive Branch decision to detain him without charge for an
    extended period, now exceeding six months. Appellee’s
    Second Suppl. Br. 6 (asserting “government decide[d] not to
    release him . . . six months ago” when it moved to dismiss his
    habeas petition). I reject that characterization.
    Rewind to September 12, 2017, when our military took
    custody of Doe. In an active combat zone, it faced the real-
    time decision of what to do with a battlefield captive who
    admitted affiliation with ISIS.        Should it detain him
    indefinitely as an enemy combatant? Transport him to the
    United States and charge him with a crime? Transfer him to a
    country with a sovereign interest in him? When the ACLUF
    filed the habeas petition on October 5, “the Government was
    still engaged in this decisional process” and had yet to choose
    a course of action. App. 161. No surprise there: the
    government had had a mere 23 days to investigate Doe. Since
    23
    then, this litigation has left the government in a poor position
    to consider, negotiate and effectuate Doe’s transfer. App. 153
    (according to State Department, litigation contingencies have
    “hinder[ed] the Department’s ability to engage constructively
    with” receiving country); see Kiyemba 
    II, 561 F.3d at 515
    (“[T]he requirement that the Government provide pre-transfer
    notice interferes with the Executive’s ability to conduct the
    sensitive diplomatic negotiations required to arrange safe
    transfers[.]”). 10
    The end result is the judicial equivalent of mission creep.
    After today, a habeas court is authorized to review not only a
    decision to “continue” Executive Branch custody of a citizen
    captured abroad on an active battlefield, 
    Hamdi, 542 U.S. at 534
    , but also—extraordinarily—a decision to discontinue it.
    Indeed, if the captive’s next friend gets to the courthouse
    quickly enough, nearly any Executive decision about the
    captive will be subject to judicial review. Doe makes no
    showing—much less a clear showing—that Hamdi reserves so
    little breathing room for the military’s on-the-ground
    judgment.
    d. Doe likewise makes no clear showing that Valentine
    v. United States ex rel. Neidecker, 
    299 U.S. 5
    (1936), or Wilson
    v. Girard, 
    354 U.S. 524
    (1957) (per curiam), supports the
    Order. He claims that Valentine forbids the government to
    10
    Doe himself argues that the government could not
    appropriately transfer him once the habeas petition was filed.
    Public Oral Arg. Tr. 59-61 (Apr. 5, 2018). And at Doe’s urging, the
    district court has issued a series of orders restricting his transfer. I
    do not suggest there was anything improper about his litigation
    choices. But they inevitably delayed the decision to transfer him.
    In my view, affirmance of the Order mistakenly lays the
    consequences of Doe’s choices at the Executive Branch’s feet.
    24
    relinquish him to another country absent “positive legal
    authority” set forth in a statute or extradition treaty. But
    Valentine involved “fugitive criminal[s]” apprehended in the
    United 
    States. 299 U.S. at 9
    , 11 (internal quotation omitted);
    see 
    id. at 6
    (they were United States citizens arrested in New
    York based on criminal charges in France). In that “very
    narrow” context, United States ex rel. Neidecker v. Valentine,
    
    81 F.2d 32
    , 33 (2d Cir. 1936), the Supreme Court required a
    “statute or treaty confer[ring] the power” to 
    extradite, 299 U.S. at 9
    .
    Doe bears no resemblance to the fugitives in Valentine.
    He voluntarily traveled abroad to an active war zone. He was
    captured on a foreign battlefield by foreign military forces.
    He admitted affiliation with a terrorist organization the United
    States is combatting militarily. And he was taken at his own
    request into United States military custody within the same
    theater of combat. Nothing in Valentine indicates that
    extradition rules apply to such a person any more than the laws
    of war apply to a fugitive criminal apprehended in the United
    States. The Supreme Court in Munaf drew a line between the
    two types of cases in rejecting Omar’s argument that the
    Executive Branch could not transfer him to Iraq “without legal
    authority” in the form of “a treaty or 
    statute.” 553 U.S. at 704
    (internal quotations omitted).         “Valentine,” the Court
    observed, was “readily distinguishable” because “[i]t involved
    the extradition of an individual from the United States.” 
    Id. (emphasis added).
    Valentine is distinguishable here for the
    same reason. Moreover, because Doe has the burden of
    persuasion, I think it significant that—despite numerous armed
    conflicts since 1936—he cites no case that has ever applied
    25
    Valentine to the wartime transfer of a battlefield captive
    abroad. 11
    Doe is similarly mistaken in suggesting that Wilson v.
    Girard requires “positive legal authority” for his transfer. At
    issue in Wilson was a bilateral Status of Forces Agreement
    between the United States and 
    Japan. 354 U.S. at 527-28
    .
    The Agreement provided that the American military had
    jurisdiction over acts committed in Japan by American
    servicemen in performance of their duties.            
    Id. The Agreement
    also required the United States to “notify” Japanese
    authorities “as soon as practicable” if it “decide[d] not to
    exercise jurisdiction.” 
    Id. at 528.
    Finally, the Agreement
    provided that the United States, when making that decision,
    was to give Japan’s interests “sympathetic consideration.” 
    Id. Against this
    backdrop, Girard, an American serviceman in
    Japan, was alleged to have killed a Japanese national there.
    11
    The phrase “positive legal authority” does not appear in
    Valentine, Munaf or any other Supreme Court precedent. Doe
    draws it from Omar v. McHugh, 
    646 F.3d 13
    (D.C. Cir. 2011), a slim
    reed on which to base such a requirement. There, on remand from
    Munaf, this Court held that Omar lacked any “right to judicial review
    of conditions in Iraq before he is transferred,” 
    id. at 18,
    but
    emphasized it was not holding that “the Executive Branch may detain
    or transfer Americans or individuals in U.S. territory at will, without
    any judicial review of the positive legal authority for the detention or
    transfer,” 
    id. at 24.
    The caveat was as obiter as dictum can be: the
    Court acknowledged that Munaf had already settled the
    government’s “authority” to transfer Omar and that, on remand, the
    Court was “addressing Omar’s separate argument . . . about
    conditions in the receiving country.” 
    Id. At all
    events, the Court
    did not purport to eliminate the sharp distinction between fugitives
    “in U.S. territory” on the one hand and “wartime military transfers”
    on the other. 
    Id. 26 354
    U.S. at 525-26. Because he did so, arguably in
    performance of his duties, 
    id. at 529
    , the Agreement “seemed
    to give [him] a right to be tried by an American military
    tribunal, not a Japanese court,” 
    Munaf, 553 U.S. at 705
    (discussing Wilson). But the Executive Branch “decided not
    to exercise . . . jurisdiction.” 
    Wilson, 354 U.S. at 529
    . Per the
    Agreement, it notified the Japanese government that it intended
    to transfer Girard to Japanese custody for trial in a Japanese
    court. 
    Id. at 526,
    529. In turn, the Japanese government
    indicted him. 
    Id. at 526.
    Girard petitioned for habeas relief
    and a district court here in the United States enjoined his
    transfer. 
    Id. Far from
    requiring affirmative authority for the
    transfer, the Supreme Court vacated the injunction because the
    Court discerned “no constitutional or statutory barrier” to the
    transfer. 
    Id. at 530
    (emphasis added). “In the absence of
    such encroachments,” the Court deferred to the “wisdom” of
    the political branches. 
    Id. The Court
    apparently saw nothing
    of relevance in Valentine, which it nowhere mentioned.
    Doe nevertheless reads Wilson to hold that “a treaty
    satisfied the requirement of positive legal authority for the
    transfer.” Appellee’s Suppl. Br. 6. He misunderstands the
    Status of Forces Agreement. The Agreement—which was
    “[t]he only ‘authority’ at issue in Wilson”—permitted the
    United States to refuse a transfer and to exercise jurisdiction
    itself notwithstanding the “background principle” that Japan,
    absent the Agreement, “had exclusive jurisdiction ‘to punish
    offenses . . . committed within its borders.’” 
    Munaf, 553 U.S. at 696
    , 705 (quoting 
    Wilson, 354 U.S. at 529
    ). The
    Agreement’s mere procedural requirements—to give Japan’s
    interests “consideration” and to promptly “notify” Japan when
    the United States “decide[d] not to exercise jurisdiction,”
    
    Wilson, 354 U.S. at 528
    (emphasis added)—were hardly
    “authority” for a transfer, let alone the sort of “positive legal
    authority” that Doe demands here. The Court in Munaf
    27
    recognized as much. It held that Wilson outright “forecloses”
    the “argument that the Executive lacks the discretion to transfer
    a citizen absent a treaty or 
    statute.” 553 U.S. at 705
    . That
    holding makes sense only if the Munaf Court rejected the
    notion that the Agreement served as “authority” for the transfer
    in Wilson.
    e. Doe suggests the foregoing analysis cannot possibly
    be correct because, as he sees it, it gives the Executive Branch
    license to run roughshod over the rights of American citizens
    with no judicial check. See, e.g., Appellee’s Br. 52 (it
    “make[s] a mockery of the Great Writ”); Appellee’s Suppl. Br.
    6 (it means citizens “surrender [their] constitutional rights
    when abroad” (internal quotation omitted)); Appellee’s Second
    Suppl. Br. 10 (it means “government’s power to dispose of
    citizens” is not “constrained by law”). None of this is so.
    When someone in Executive Branch custody files a habeas
    petition, the federal courts ensure that the Executive handles
    him “in accordance with law,” including due process. 
    Hamdi, 542 U.S. at 525
    (citing INS v. St. Cyr, 
    533 U.S. 289
    , 301
    (2001)). But there are limits to a habeas court’s equitable
    power, even if the petitioner is a citizen. Under Munaf, for
    example, “prudential concerns . . . may require [the] court to
    forgo the exercise of its habeas corpus 
    power.” 553 U.S. at 693
    (internal quotations omitted). I have explained why, in
    my view, considerations of comity and separation of powers
    preclude the Order here. Especially important to me are Doe’s
    voluntary travel abroad to a war zone during active hostilities;
    his capture on a foreign battlefield by foreign military forces;
    his admitted affiliation with a terrorist organization the United
    States is combatting militarily; the Executive Branch’s
    resulting good-faith determination that Doe is an enemy
    combatant; Doe’s continued presence in the same active theater
    28
    of combat as his capture; and the receiving country’s facially
    compelling interest in his transfer.
    If these facts differed, the prudential considerations might
    differ and the district court might have equitable authority to
    block a transfer. For instance, Munaf reserves the possibility
    of judicial intervention if the Executive Branch “determine[s]
    that a detainee is likely to be tortured but decides to transfer
    him 
    anyway.” 553 U.S. at 702
    . Similarly, the government
    appears to concede “that the courts have a role to play” in
    ensuring that the Executive Branch does not transfer a
    battlefield captive to a country that lacks a “legitimate basis”
    in law to receive him. Public Oral Arg. Tr. 10, 17, 34 (Apr. 5,
    2018).
    Here, however, we have no record-based reason to assume
    Executive Branch bad faith or negligence. Rather, as the
    Supreme Court admonished in Munaf, “we need not assume the
    political branches are oblivious” to a transferee’s 
    well-being. 553 U.S. at 702
    (quoting 
    Omar, 479 F.3d at 20
    n.6 (Brown, J.,
    dissenting in part)). Nor should we be distracted by any
    “farfetched hypothetical[],” Gutierrez v. Waterman Steamship
    Corp., 
    373 U.S. 206
    , 210 (1963), that “veers far from the case
    before us,” Digital Realty Trust, Inc. v. Somers, 
    138 S. Ct. 767
    ,
    781 (2018); see, e.g., Public Oral Arg. Recording 34:20-34:48
    (Apr. 27, 2018) (Doe hypothesizes transfer “to Bolivia or
    Madagascar” or some other country with no sovereign interest
    in him); see also, e.g., Maj. Op. 20-22 (majority hypothesizes
    transfer to Thailand based on political criticism).
    The long and short of it is that Doe does not dispositively
    differ from the petitioners in Munaf. Necessarily, I do not read
    that opinion the same way my colleagues do. On their view,
    “the war-related context” of Munaf “did not diminish” the
    military’s discretion to transfer Omar to Iraqi authorities, at
    29
    least as compared to the military’s discretion to transfer Girard
    to Japanese authorities during peacetime. Maj. Op. 15. If my
    colleagues imply that the war context of Munaf made no
    difference, I disagree: the Supreme Court was explicit that
    “more [was] at issue” in Munaf than in Wilson, which did not
    involve a petitioner captured on a battlefield in “‘an active
    theater of combat’” “during ongoing hostilities.” 
    Munaf, 553 U.S. at 699
    -700 (accepting government’s characterization to
    that effect). Although my colleagues do not mention it, those
    are the very circumstances that gave rise to the Court’s
    “concerns about unwarranted judicial intrusion into the
    Executive’s ability to conduct military operations abroad.” 
    Id. at 700.
    Those same circumstances—and, thus, those same
    separation of powers concerns—are equally in play here.
    Doe’s battlefield capture during ongoing hostilities and his
    admitted affiliation with ISIS align him with the Munaf
    petitioners and readily distinguish him from the civilians in my
    colleagues’ counterfactual detours. Maj. Op. 4, 18, 20-22.
    B. OTHER FACTORS
    Because I believe Doe has not demonstrated a likelihood
    of success, I do not think it strictly necessary to consider the
    other preliminary injunction factors. See Kiyemba 
    II, 561 F.3d at 516
    (vacating injunction without consideration of other
    factors because Uighurs did not “make the required showing of
    a likelihood of success on the merits”); see also, e.g., Greater
    New Orleans Fair Hous. Action Ctr. v. HUD, 
    639 F.3d 1078
    ,
    1088 (D.C. Cir. 2011) (“When a plaintiff has not shown a
    likelihood of success on the merits, there is no need to consider
    the remaining factors.”). Nevertheless, I briefly address the
    remaining factors because in my view the Order badly
    misjudges them.
    30
    Irreparable harm. This Court “has set a high standard”
    for irreparable harm: “the injury must be both certain and
    great” and “must be actual and not theoretical.” Chaplaincy
    of Full Gospel Churches v. England, 
    454 F.3d 290
    , 297 (D.C.
    Cir. 2006) (internal quotation omitted). On this requirement,
    too, Doe falls short.
    The district court finds that Doe will suffer irreparable
    harm absent the Order because, once transferred, he “will lose
    his constitutional right to contest his detention in a U.S. court.”
    Mem. Op. 5. That is half right: because Doe’s petition
    challenges his detention by the Executive Branch, he will no
    longer have a viable habeas case once it divests itself of
    custody. See Qassim v. Bush, 
    466 F.3d 1073
    , 1074-77 (D.C.
    Cir. 2006) (per curiam) (transfer of Uighurs from Guantanamo
    Bay to Albania effected release and mooted habeas claims); see
    also supra pp. 17-18. Contrary to the district court’s view,
    however, Doe has no cognizable interest in pursuing his
    petition once he is released from the very custody he
    challenges. See 
    Munaf, 553 U.S. at 692
    -93 (it was “not
    appropriate” to enjoin transfer to ensure petitioners could
    litigate their claim that “they are innocent civilians”). And
    because Doe has no cognizable interest in litigating a moot
    petition, he will suffer no “certain,” “great” and “actual” harm
    from being denied the opportunity to pursue it. 
    England, 454 F.3d at 297
    (internal quotation omitted); see Ralph v. Lucent
    Techs., Inc., 
    135 F.3d 166
    , 170 (1st Cir. 1998) (“A federal court
    must find a cognizable threat of irreparable harm as an essential
    prerequisite to the issuance of a preliminary injunction.”
    (emphasis added)).
    Even apart from the mootness problem, Doe’s litigating
    position precludes him from showing irreparable harm. He
    says he seeks nothing more than “release simplicit[er]”—that
    is, “for the United States simply to open the jailhouse doors and
    31
    let him go” in Iraq. Public Oral Arg. Tr. 80 (Apr. 5, 2018).
    He does not ask to be transported to the United States. He
    concedes that the Executive Branch is free to notify Iraqi
    authorities upon his release and that, immediately thereafter,
    the Iraqi government or other foreign authorities are free to
    apprehend him.
    These are major concessions, and necessary ones. See
    
    Munaf, 553 U.S. at 689
    (district court could not forbid
    Executive from “sharing” with Iraqi government “details
    concerning any decision to release Omar”); 
    id. at 694
    (it could
    not require Executive to “shelter” Omar from prosecution in
    Iraq); 
    id. at 6
    97 (it could not order Executive to “smuggle”
    Omar “out of Iraq”). As the government aptly observes, the
    concessions mean there is “little practical difference . . .
    between the ‘release’ that [Doe] seeks and the ‘transfer’ that
    the Government proposes to undertake.” Appellant’s Suppl.
    Br. 11.
    Doe resists this logic because it is “speculat[ive].”
    Appellee’s Suppl. Br. 11. For all we know, he says, no one
    will seek to detain him if our military lets him go. This is
    classic wishful thinking. Because of his admitted affiliation
    with ISIS—and because Iraq and Saudi Arabia are both
    members of the coalition against ISIS, see Partners, supra—I
    believe it is all but certain he will again be held abroad if the
    United States releases him. 12 And any uncertainty on that
    12
    I recognize that the country and circumstances of such
    further detention might differ if the United States were to relinquish
    Doe to the Saudi government instead of “simply . . . open[ing] the
    jailhouse doors” and subjecting him to recapture. Public Oral Arg.
    Tr. 80 (Apr. 5, 2018). But Doe does not allege, let alone show, that
    the conditions of detention in the latter scenario would be cognizably
    preferable to the conditions in the former. In any event, judges are
    ill positioned to compare conditions of detention. Cf. Munaf, 553
    32
    score operates against Doe, not for him. After all, he must
    prove that, absent the Order, he will suffer “certain,” “great”
    and “actual” harm. 
    England, 454 F.3d at 297
    (internal
    quotation omitted). He has failed that task.
    Balance of equities. The district court finds that “the
    potential harm to bilateral relations between the United States
    and its strategic ally does not outweigh [Doe’s] constitutional
    right to seek habeas relief.” Mem. Op. 6. But as just
    discussed, Doe seeks an end to Executive Branch custody; the
    Executive Branch will in fact end that custody by relinquishing
    him to the Saudi government; and Doe does not demonstrate
    that he will suffer cognizable harm if the Executive Branch so
    relinquishes him instead of “simply . . . open[ing] the jailhouse
    doors” in Iraq. Public Oral Arg. Tr. 80 (Apr. 5, 2018); see
    supra note 12. On the other side of the balance, I take the
    Executive Branch’s word that blocking the transfer
    complicates our diplomatic relations with the receiving
    country.                Decl. ¶¶ 8-10 (Apr. 16, 2018); see 
    Latif, 677 F.3d at 1178-85
    (applying presumption of regularity in
    analogous setting). Common sense and circuit precedent
    support its assertion. Kiyemba 
    II, 561 F.3d at 515
    (even
    requiring “pre-transfer notice interferes with the Executive’s
    ability to conduct the sensitive diplomatic negotiations
    required to arrange safe transfers”).
    In these circumstances, the Executive Branch’s interest in
    completing the transfer is at least as strong as Doe’s interest in
    blocking it. See De Arellano v. Weinberger, 
    788 F.2d 762
    ,
    764 (D.C. Cir. 1986) (en banc) (per curiam) (where injunction
    will “intrude[] into the conduct of foreign and military affairs”
    and “‘embarrass the accomplishment of important
    U.S. at 702 (“The Judiciary is not suited . . . to pass judgment on
    foreign justice systems[.]”).
    33
    governmental ends, a court of equity acts with caution and only
    upon clear showing that its intervention is necessary in order to
    prevent an irreparable injury’” (quoting Hurley v. Kincaid, 
    285 U.S. 95
    , 104 n.3 (1932))).
    The public interest. Most of what has already been said
    also goes to the question of where the public interest lies. But
    some final observations are in order. The district court
    concluded that a citizen’s right to contest his military transfer
    outweighs the government’s military and diplomatic priorities.
    Mem. Op. 6. That conclusion is shortsighted for at least two
    reasons.
    First, judicial intrusions like the Order cost the Executive
    Branch valuable diplomatic capital. App. 152-54 (declaration
    of State Department official);               Decl. ¶¶ 8-10 (Apr.
    16, 2018) (subsequent declaration of same official); see
    Kiyemba 
    II, 561 F.3d at 515
    . Within bounds that have nowise
    been exceeded in Doe’s case, Executive Branch officials have
    wide discretion to spend that limited capital as they see fit.
    Judges ought not lightly cause them to waste it, especially if it
    might better be spent on ensuring that the United States, in
    future negotiations, obtains custody of persons in whom it has
    a compelling sovereign interest.
    Second, contrary to Doe’s hyperbole, the Order and its
    affirmance will not necessarily favor “the errant tourist,
    embedded journalist, or local aid worker [who seeks] to prove
    military error.” Appellee’s Br. 24 (quoting 
    Hamdi, 542 U.S. at 534
    ). What if our military had known before taking custody
    of Doe that it would not be permitted to relinquish him to an
    ally with a facially strong interest in him unless it first
    litigated—in distant courts, for months, if not years, on end—
    the ability to do so? Would our commanders in the field have
    declined custody, leaving a citizen to the actions of other
    34
    countries or, even worse, to the chaos of the battlefield? It
    seems to me that today’s result gives the military an incentive
    to avoid custody when possible, especially if it is not
    immediately clear in the heat of combat that the captive is a
    U.S. citizen. And I doubt that the innocent American citizen
    who finds himself on a foreign battlefield could fare better than
    in the custody of our military.
    *****
    To borrow an understatement, the Order is “not
    appropriate.” 
    Munaf, 553 U.S. at 693
    . I would vacate it.
    Accordingly, I respectfully dissent.