Source: https://www.globalsecurity.org/security/library/policy/national/doj-wp-imminent-threat.htm
Timestamp: 2019-04-24 02:56:01+00:00

Document:
This white paper sets forth a legal framework for considering the circumstances in which the U.S. government could use lethal force in a foreign country outside the area of active hostilities against a U.S. citizen who is a senior operational leader of al-Qa'ida or an associated force1 of al-Qa'ida - that is, an al-Qa'ida leader actively engaged in planning operations to kill Americans. The paper does not attempt to determine the minimum requirements necessary to render such an operation lawful; nor does it assess what might be required to render a lethal operation against a U.S. citizen lawful in other circumstances, including an operation against enemy forces on a traditional battlefield or an operation against a U.S. citizen who is not a senior operational leader of such forces. Here the Department of Justice concludes only that where the following three conditions are met, a U.S. operation using lethal force in a foreign country against a U.S. citizen who is a senior operational leader of al-Qa'ida or an associated force would be lawful: (1) an informed high-level official of the U.S. government has determined that the targeted individual poses an imminent threat of violent attack against the United States; (2) capture is infeasible, and the United States continues to monitor whether capture becomes feasible; and (3) the operation would be conducted in a manner consistent with applicable law of war principles. This conclusion is reached with recognition of the extraordinary seriousness of a lethal operation by the United States against a U.S. citizen, and also of the extraordinary seriousness of the threat posed by senior operational al-Qa'ida members and the loss of life that would result were their operations successful.
determination that the host nation is unable or unwilling to suppress the threat posed by the individual targeted.
Were the target of a lethal operation a U.S. citizen who may have rights under the Due Process Clause and the Fourth Amendment, that individual's citizenship would not immunize him from a lethal operation. Under the traditional due process balancing analysis of Mathews v. Eldridge, we recognize that there is no private interest more weighty than a person's interest in his life. But that interest must be balanced against the United States' interest in forestalling the threat of violence and death to other Americans that arises from an individual who is a senior operational leader of al-Q'aida or an associated force of al-Q'aida and who is engaged in plotting against the United States.
The paper begins with a brief summary of the authority for the use of force in the situation described here, including the authority to target a U.S. citizen having the characteristics described above with lethal force outside the area of active hostilities. It continues with the constitutional questions, considering first whether a lethal operation against such a U.S. citizen would be consistent with the Fifth Amendment's Due Process Clause, U.S. Const. amend. V. As part of the due process analysis; the paper explains the concepts of "imminence," feasibility of capture, and compliance with applicable law of war principles. The paper then discusses whether such an operation would be consistent with the Fourth Amendment's prohibition on unreasonable seizures, U.S. Const. amend. IV. It concludes that where certain conditions are met, a lethal operation against a U.S. citizen who is a senior operational leader of al-Qa'ida or its associated forces - a terrorist organization engaged in constant plotting against the United States, as well as an enemy force with which the United States is in a congressionally authorized armed conflict - and who himself poses an imminent threat of violent attack against the United States, would not violate the Constitution. The paper also includes an analysis concluding that such an operation would not violate certain critical provisions prohibiting the killing of U.S. nationals outside the United States; nor would it constitute either the commission of a war crime or an assassination prohibited by Executive Order No. 12333.
The United States is in an armed conflict with al-Qa' ida and its associated forces, and Congress has authorized the President to use all necessary and appropriate force against those entities. See Authorization for Use of Military Force ("AUMF"), Pub. L. No. 107-40, § 2(a), 115 Stat. 224, 224 (2001). In addition to the authority arising from the AUMF, the President's use of force against al-Qa'ida and associated forces is lawful under the principles of U.S. and international law, including the President's constitutional responsibility to protect the nation and the inherent right to national self-defense recognized in international law (see, e.g., U.N. Charter art. 51). It was on these bases that the United States responded to the attacks of September II, 2001 , and "[t]hese domestic and international legal authorities continue to this day." Harold Hongju Koh, Legal Adviser, U.S. Department of State, Address to the Annual Meeting of the American Society of International Law: The Obama Administration and International Law (Mar. 25, 2010) ("2010 Koh ASIL Speech").
Any operation of the sort discussed here would be conducted in a foreign Country against a senior operational leader of al-Qa'ida or its associated forces who poses an imminent threat of violent attack against the United States. A use of force under such circumstances would be justified as an act of national self-defense. In addition, such a person would be within the core of individuals against whom Congress has authorized the use of necessary and appropriate force. The fact that such a person would also be a U.S. citizen would not alter this conclusion. The Supreme Court has held that the military may constitutionally, use force against a U.S. citizen who is a part of enemy forces. See Hamdi, 542 U.S. 507, 518 (2004) (plurality opinion); id. at 587, 597 (Thomas, J., dissenting); Ex Parte Quirin, 317 U.S. at 37-38. Like the imposition of military detention, the use of lethal force against such enemy forces is an "important incident of war." Hamdi, 542 U.S. at 518 (plurality opinion) (quotations omitted). See, e.g., General Orders No. 100: Instructions for the Government of Armies of the United States in the Field ¶ 15 (Apr. 24, 1863) ("[m]ilitary necessity admits of all direct destruction of life or limb of armed enemies") (emphasis omitted); International Committee of the Red Cross, Commentary on the Additional Protocols of 8 June 1977 to the Geneva Conventions of 12 Aug. 1949 and Relating to the Protection of Victims of Non-International Armed Conflicts (Additional Protocol II) § 4789 (1987) ("Those who belong to armed forces or armed groups may be attacked at any time"); Yoram Dinstein, The Conduct of Hostilities Under the Law of International Armed Conflict 94 (2004) ("When a person takes up arms or merely dons a uniform as a member of the armed forces he automatically exposes himself to attack.") Accordingly, the Department does not believe that U.S. citizenship would immunize a senior operational leader of al-Qa'ida or its associated forces from a use of force abroad authorized by the AUMF or in national self-defense.
Letter for the Speaker of the House of Representatives and the President Pro Tempore of the Senate from the President (June 15, 2010) (reporting that the armed forces, with the assistance of numerous international partners, continue to conduct operations "against al-Qa'ida terrorists," and that the United States has "deployed combat-equipped forces to a number of locations in the U.S. Central...Command area of operation in support of those [overseas counter-terrorist] operations"); Bensayah v. Obama, 610 F.3d 718, 720, 724-25,727 (D.C. Cir. 2010) (concluding that an individual turned over to the United States in Bosnia could be detained if the government demonstrates he was part of al-Qa'ida); al-Adahi v. Obama, 613 F.3d 1102, 1003, 1111 (D.C. Cir. 2010) (noting authority under AUMF to detain individual apprehended by Pakistani authorities in Pakistan and then transferred to U.S. custody).
Claiming that for purposes of international aw, an armed conflict generally exists only when there is "protracted armed violence between governmental authorities and organized armed groups," Prosecutor v. Tadic, Case No. IT-94-1AR72, Decision on the Defence Motion for Interlocutory Appeal on Jurisdiction, , 70 (Int'l Crim. Trib. for the Former Yugoslavia, App. Chamber Oct. 2, 1995), some commenters have suggested that the conflict between the United States and al-Qa'ida cannot lawfully extend to nations outside Afghanistan itself. See, e.g., Mary Ellen O'Connell, Combatants and the Combat Zone, 43 U. Rich. L. Rev. 845, 857-59 (2009). There is little judicial or other authoritative precedent that speaks directly to the question of the geographic scope of a non-international armed conflict in which one of the parties is a transnational, non-state actor and where the principal theater of operations is not within the territory of the nation that is a party to the conflict. Thus, in considering this potential issue. the Department looks to principles and statements from analogous contexts.
If an operation of the kind discussed in this paper were to occur in a location where al-Qa'ida or an associated force has a significant and organized presence and from which al-Qa'ida or an associated force, including its senior operational leaders, plan attacks against U.S. persons and interests, the operation would be part of the non-international armed conflict between the United States and al-Qa'ida that the Supreme Court recognized in Hamdan. Moreover, such an operation would be consistent with international legal principles of sovereignty and neutrality if it were conducted, for example, with the consent of the host nation's government or after a determination that the host nation is unable or unwilling to suppress the threat posed by the individual targeted. In such circumstances, targeting a U.S. citizen of the kind described in this paper would be authorized under the AUMF and the inherent right to national self-defense. Given this authority, the question becomes whether and what further restrictions may limit its exercise.
The Department assumes that the rights afforded by Fifth Amendment's Due Process Clause, as well as the Fourth Amendment, attach to a U.S. citizen even while he is abroad. See Reid v. Covert, 354 U.S. 1, 5-6 (1957) (plurality opinion); United States v. Verdugo-Urquidez, 494 U.S. 259, 269-70 (1990); see also In re Terrorist Bombings of U.S. Embassies in East Africa, 552 F.3d 157, 170 n.7 (2d Cir. 2008). The U.S. citizenship of a leader of al-Qa'ida or its associated forces, however, does not give that person constitutional immunity from attack. This paper next considers whether and in what circumstances a lethal operation would violate any possible constitutional protections of a U.S. citizen.
United States, and who wished to challenge the government's assertion that he was part of enemy forces. The Court explained that the "process due in any given instance is determined by weighing 'the private interest that will be affected by the official action' against the government's asserted interest, 'including the function involved' and the burdens the government would face in providing greater process." Hamdi, 542 U.S. at 529 (plurality opinion) (quoting Mathews v. Eldridge, 424 U.S. 319, 335 (1976)). The due process balancing analysis applied to determine the Fifth Amendment rights of a U.S. citizen with respect to law-of-war detention supplies the framework for assessing the process due a U.S. citizen who is a senior operational leader of an enemy force planning violent attacks against Americans before he is subjected to lethal targeting.
those realities." Id. at 531 (plurality opinion). These same realities must also be considered in assessing "the burdens the government would face in providing greater process" to a member of enemy forces. Id. at 529, 531 (Plurality opinion).
U.S. at 535 (plurality opinion) (noting that the Court "accord[s] the greatest respect and consideration to the judgments of military authorities in matters relating to the actual prosecution of war, and...the scope of that discretion necessarily is wide"); id. at 534 (plurality opinion) ("The parties agree that the initial captures on the battlefield need not receive the process we have discussed here; that process is due only when the determination is made to continue to hold those who have been seized." (emphasIs omitted).
Certain aspects of this legal framework require additional explication. First, the condition that an operational leader present an "imminent" threat of violent attack against the United States does not require the United States to have clear evidence that a specific attack on U.S. persons and interests will take place in the immediate future. Given the nature of, for example, the terrorist attacks on September 11, in which civilian airliners were hijacked to strike the World Trade Center and the Pentagon, this definition of imminence, which would require the United States to refrain from action until preparations for an attack are concluded, would not allow the United States sufficient time to defend itself. The defensive options available to the United States may be reduced or eliminated if al-Qa'ida operatives disappear and cannot be found when the time of their attack approaches. Consequently, with respect to al-Qa'ida leaders who are continually planning attacks, the United States is likely only to have a limited window of opportunity within which to defend Americans in a manner that has both a high likelihood of success and sufficiently reduces the probabilities of civilian causalities. See Michael N. Schmitt, State-Sponsored Assassination in International and Domestic Law, 17.Yale J. Int'I L. 609, 648 (1992). Furthermore, a ''terrorist ' war' does not consist of a massive attack across an international border, nor does it consist of one isolated incident that occurs and is then past. It is a drawn out, patient, sporadic pattern of attacks. It is very difficult to know when or where the next incident will occur." Gregory M. Travalio, Terrorism, International Law, and the Use of Military Force, 18 Wis. Int'l L.J. 145, 173 (2000); see also Testimony of Attorney-General Lord Goldsmith, 660 Hansard. H.L. (April 21, 2004) 370 (U.K.) available at http://www.publications.parliament.uk/pa/ld200304/ldhansrd/vo040421-07.htm (what constitutes an imminent threat "will develop to meet new circumstances and new threats... It must be right that states are able to act in self-defense in circumstances where there is evidence of further imminent attacks by terrorist groups, even if there is no specific evidence of where such an attack will take place or of the precise nature of the attack."). Delaying action against individuals continually planning to kill Americans until some theoretical end stage of the planning for a particular plot would create an unacceptably high risk that the action would fail and that American casualties would result.
determining whether an al-Qa'ida operational leader presents an imminent threat of violent attack against the United States must take into account that certain members of al-Qa'ida (including any potential target of lethal force) are continually plotting attacks against the United States; that al-Qaida would engage in such attacks regularly to the extent it were able to do so; that the U.S. government may not be aware of all al-Qa'ida plots as they are developing and thus cannot be confident that none is about to occur; and that, in light of these predicates, the nation may have a limited window of opportunity within which to strike in a manner that both has a high likelihood of success and reduces the probability of American casualties.
With this understanding, a high-level official could conclude, for example, that an individual poses an "imminent threat" of violent attack against the United States where he is an operational leader of al-Qa'ida or an associated force and is personally and continually involved in planning terrorist attacks against the United States. Moreover. where the al-Qa'ida member in question has recently been involved in activities posing an imminent threat of violent attack against the United States, and there is no evidence suggesting that he has renounced or abandoned such activities, that member's involvement in al-Qa'ida's continuing terrorist campaign against the United States would support the conclusion that the member poses an imminent threat.
relevant country were to decline to consent to a capture operation. Other factors such as undue risk to U.S. personnel conducting a potential capture operation also could be relevant. Feasibility would be a highly fact-specific and potentially time-sensitive inquiry.
any other law-of-war grounds precluding use of such tactics. See Dinstein, Conduct of Hostilities at 94-95, 199; Abraham D. Sofaer. Terrorism, the Law, and the National Defense, 126 Mil. L. Rev. 89, 120-21 (1989). Relatedly "there is no prohibition under the laws of war on the use of technologically advanced weapons systems in armed conflict - such as pilotless aircraft or so-called smart bombs - as long as they are employed in conformity with the with applicable laws of war." 2010 Koh ASIL Speech. Further, under this framework, the United States would: also be required to accept a surrender if it were feasible to do so.
In sum, an operation in the circumstances and under the constraints described above would not result in a violation of any due process rights.
Similarly, assuming that a lethal operation targeting a U.S. citizen abroad who is planning attacks against the United States would result in a "seizure" under the Fourth Amendment, such an operation would not violate that Amendment in the circumstances posited here. The Supreme Court has made clear that the constitutionality of a seizure is determined by "balanc[ing] the nature and quality of the intrusion on the individual's Fourth Amendment interests against the importance of the governmental interests alleged to justify the intrusion" Tennesse v. Garner, 471 US. 1, 8 (1985) (internal quotation marks omitted); accord Scott v. Harris, 550 U.S. 372, 383 (2007). Even in domestic law enforcement operations, the Court has noted that "[w]here the officer has probable cause to believe that the suspect poses a threat of serious physical harm, either to the officer or to others, it is not constitutionally unreasonable to prevent escape by using deadly force." Garner, 471 U.S. at 11. Thus, "if the suspect threatens the officer with a weapon or there is probable cause to believe that he has committed a crime involving the infliction or threatened infliction of serious physical harm, deadly force may be used if necessary to prevent escape, and if, where feasible, some warning has been given." Id. at 11-12.
constitute a reasonable use of lethal force for purposes of domestic law enforcement operations differs substantially from what would be reasonable in the situation and circumstances discussed in this white paper. But at least in circumstances where the targeted person is an operational leader of an enemy force and an informed, high-level government official has determined that he poses an imminent threat of violent attack against the Untied States, and those conducting the operation would carry out the operation only if capture were infeasible, the use of lethal force would not violate the Fourth Amendment. Under such circumstances, the intrusion on any Fourth Amendment interests would be outweighed by the "importance of the governmental interests [that] justify the intrusion," Garner, 471 U.S. at 8 - the interests in protecting the lives of Americans.
Finally, the Department notes that under the circumstances described in this paper, there exists no appropriate judicial forum to evaluate these constitutional considerations. It is well established that "[m]atters intimately related to foreign policy and national security are rarely proper subjects for judicial intervention," Haig v. Agee, 453 U.S. 280. 292 (1981). because such matters "frequently turn on standards that defy judicial application," or "involve the exercise of a discretion demonstrably committed to the executive or legislature." Baker v. Carr, 369 U.S. 186, 211 (1962). Were a court to intervene here, it might be required inappropriately to issue an ex ante command to the President and officials responsible for operations with respect to their specific tactical judgment to mount a potential lethal operation against a senior operational leader of al-Qa'ida or its associated forces. And judicial enforcement of such orders would require the Court to supervise inherently predictive judgments by the President and his national security advisors as to when and how to use force against a member of an enemy force against which Congress has authorized the use of force.
Although section 1119(b) refers only to the "punish[ments]" provided under sections 1111, 1112, and 1113, courts have held that section 1119(b) incorporates the substantive elements of those cross-referenced provisions of title 18. See, e.g., United States v. Wharton, 320 F.3d 526, 533 (5th Cir. 2003); United States v. White, 51 F. Supp. 2d 1008, 1013-14 (E.D. Cal. 1997). Section 1111 of title 18 sets forth criminal penalties for "murder," and provides that "[m]urder is the unlawful killing of a human with malice aforethought." 18 U.S.C. § 1111(a). Section 1112 similarly provides criminal sanctions for "[m]anslaughter," and states that "[m]anslaughter is the unlawful killing of a human being without malice." Id.. § 1112(a). Section 1113 provides criminal penalties for "attempts to commit murder or manslaughter." Id. § 1113. It is therefore clear that section 1119(b) bars only "unlawful killing."
Guidance as to the meaning of the phrase "unlawful killing" in sections 1111 and 1112-and thus for purposes of section 1119(b)-can be found in the historical understandings of murder and manslaughter. That history shows that states have long recognized justifications and excuses to statutes criminalizing "unlawful" killings.5 One state court, for example, in construing that states' murder statute, explained that "the word 'unlawful' is a term of art" that "connotes a homicide with the absence of factors of excuse or justification." People v. Frye, 10 Ca. Rptr. 2d 217, 221 (Cal. Ct. App. 1992). That court further explained that the factors of excuse or justification in question include those that have traditionally been recognized. Id. at 221 n.2. Other authorities support the same conclusion. See, e.g., Mullaney v. Wilbur, 421 U.S. 684, 685 (1975) (requirement of "unlawful" killing in Maine murder statute meant that killing was "neither justifiable nor excusable"); cf. also Rollin M. Perkins & Ronald N. Boyce, Criminal Law 56 (3d ed. 1982) ("Innocent homicide is of two kinds, (1) justifiable and (2) excusable."). Accordingly, section 1119 does not proscribe killings covered by a justification traditionally recognized under the common law or state and federal murder statues. "Congress did not intend [section 1119] to criminalize justifiable or excusable killings." White, 51 F. Supp. 2d at 1013.
authority justification. Prosecutions where such a "public authority" justification is invoked are understandably rare, see American Law Institute Model Penal Code and Commentaries § 3.03 Comment 1, at 23-24 (1985); cf. Visa Fraud Investigation, 8 Op. O.L.C. 284, 285 n.2, 286 (1984), and thus there is little case law in which courts have analyzed the scope of the justification with respect to the conduct of government officials. Nonetheless, discussions in the leading treatises and in the Model Penal Code demonstrate its legitimacy. See 2 Wayne R. Lafave, Substantive Criminal Law § 10.2(b), at 135 (2d ed. 2003); Perkins & Boyce, Criminal Law at 1093 ("Deeds which otherwise would be criminal, such as taking or destroying property, taking hold of a person by force and against his will, placing him in confinement, or even taking his life, are not crimes if done with proper public authority."); see also Model Penal Code § 3.03(1)(a), (d), (c), at 22-23 (proposing codification or justification where conduct is "required or authorized by," inter alia, "the law defining the duties or functions of a public officer," "the law governing the armed services or the lawful conduct of war," or "any other provision of law imposing a public duty"); National Commission on Reform of Federal Criminal Laws, A Proposed New Federal Criminal Code § 602(1) (1971) ("Conduct engaged in by a public servant in the course of his official duties is justified when it is required or authorized by law."). And the Department's Office of Legal Counsel ("OLC") has invoked analogous rationales when it has analyzed whether Congress intended a particular criminal statute to prohibit specific conduct that otherwise falls within a government agency's authorities. See, e.g., Visa Fraud Investigation, 8 Op. O.L.C. at 287-88 (concluding that a civil statute prohibiting issuance of visa to an alien known to be ineligible did not prohibit State Department from issuing such a visa where "necessary" to facilitate an important Immigration and Naturalization Service undercover operation carried out in a "reasonable" fashion).
could be encompassed by that justification and. in particular. whether that justification would apply when the target is a U.S. citizen. The analysis here leads to the conclusion that it would.
that Shoot Down Civil Aircraft Involved in Drug Trafficking, 18 Op. O.L.C. 148, 164 (1994) (concluding that the Aircraft Sabotage Act of 1984, 18 U.S.C. § 32(b)(2) (2006), which prohibits the willful destruction of a civil aircraft and otherwise applies to U.S. government conduct, should not be construed to have "the surprising and almost certainly unintended effect of criminalizing actions by military personnel that are lawful under international law and the laws of armed conflict").
The fact that an operation may target a U.S. citizen does not a1ter this conclusion. As explained above, see supra at 3, the Supreme Court has held that the military may constitutionally use force against a U.S. citizen who is part of enemy forces. See Hamdi, 542 U.S. at 518 (plurality opinion); id. at 587, 597 (Thomas J., dissenting); Ex Parte Quirin, 317 U.S. at 37-38 ("Citizens who associate themselves with the military arm of the enemy government, and with its aid, guidance and direction enter [the United States] bent on hostile acts," may be treated as "enemy belligerents" under the law of war.). Similarly, under the Constitution and the inherent right to national self-defense recognized in international law, the President may authorize the use of force against a U:S. citizen who is a member of al-Qa'ida or its associated forces and who poses an imminent threat of violent attack against the United States.
In light of these precedents, the Department believes that the use of lethal force addressed in this white paper would constitute a lawful killing under the public authority doctrine if conducted in a manner consistent with the fundamental law of war principles governing the use of force in a non-international armed conflict. Such an operation would not violate the assassination ban in Executive Order No. 12333. Section 2.11 of Executive Order No. 12333 provides that "[n]o person employed by or acting on behalf of the United States Government shall engage in, or conspire to engage in, assassination." 46 Fed. Reg. 59,941, 59, 952 (Dec. 4,1981). A lawful killing in self-defense is not an assassination. In the Department's view, a lethal operation conducted against a U.S. citizen whose conduct poses an imminent threat of violent attack against the United States would be a legitimate act of national self-defense that would not violate the assassination ban. Similarly, the use of lethal force, consistent with the laws of war, against an individual who is a legitimate military target would be lawful and would not violate the assassination ban.
Id. § 2441(c)(3). As defined by the statute, a "grave breach" of Common Article 3 includes "[m]urder," described in pertinent part as "[t]he act of a person who intentionally kills, or conspires or attempts to kill...one or more persons taking no active part in the hostilities, including those placed out of combat by sickness, wounds, detention, or any other cause." Id. § 2441(d)(1)(D).
Whatever might be the outer bounds of this category of covered persons, Common Article 3 does not alter the fundamental law of war principle concerning a belligerent party's right in an armed conflict to target individuals who are part of an enemy's armed forces or eliminate a nation's authority to take legitimate action in national self-defense. The language of Common Article 3 "makes clear that members of such armed forces [of both state and non-state parties to the conflict]...are considered as 'taking no active part in the hostilities' only once they have disengaged from their fighting function ('have laid down their arms') or are placed hors de combat; mere suspension of combat is insufficient." International Committee of the Red Cross, Interpretive Guidance on the Notion of Direct Participation in Hostilities Under International Humanitarian Law 28 (2009). An operation against a senior operational leader of al-Qa'ida or its associated forces who poses an imminent threat of violent attack against the United States would target a person who is taking "an active part in hostilities" and therefore would not constitute a "grave breach" of Common Article 3.
In conclusion, it would be lawful for the United States to conduct a lethal operation outside the United States against a U.S. citizen who is a senior, operational leader of al-Qaida or an associated force ofal-Qa'ida without violating the Constitution or the federal statutes discussed in this white paper under the following conditions: (1) an informed, high-level official of the U.S. government has determined that the targeted individual poses an imminent threat of violent attack against the United States; (2) capture is infeasible, and the United States continues to monitor whether capture becomes feasible; and (3) the operation is conducted in a manner consistent with the four fundamental principles of the laws of war governing the use of force. As stated earlier, this paper does not attempt to determine the minimum requirements necessary to render such an operation lawful, nor does it assess what might be required to render a lethal operation against a U.S. citizen lawful in other circumstances. It concludes only that the stated conditions would be sufficient to make lawful a lethal operation in a foreign country directed against a U.S. citizen with the characteristics described above.
1 - An associated force of al-Qa'ida includes a group that would qualify as a co-belligerent under the laws of war. See Hamlily v. Obama, 616 F. Supp. 2d 63, 74-75 (D.D.C. 2009) (authority to detain extends to "'associated forces,'" which "mean 'co-belligerents' as that term is understood under the laws of war").
2 - See Prosecutor v. Tadic, Case No. IT-94-1AR72, Submission of the Government of the United States of America Concerning Certain Arguments Made by Counsel for the Accused, at 27-28 (Int'l Crim. Trib. For the Former Yugoslavia, App. Chamber July 17, 1995) (in determining which body of law applies in a particular conflict, "the conflict must be considered as a whole, and "it is artificial and improper to attempt to divide it into isolated segments, either geographically or chronologically").
3 - See also 18 U.S.C. § 1119(a) (2006) (providing that "'national of the United States' has the meaning stated in section 101 (a)(22) of the Immigration and Nationality Act," 8 U.S.C. § 1101(a)(22) (2006)).
4 - In light of the conclusion that section 1119 and the statutes it cross-references incorporate this justification, and that the justification would cover an operation of the sort discussed here, this discussion does not address whether an operation of this sort could be lawful on any other grounds.
history of section 2339C makes clear that "[t]he term 'unlawfully' is intended to embody common law defenses." H.R Rep. No. 107-307, at 12 (2001).
6 - Each potentially applicable statute must be carefully and separately examined to discern Congress's intent in this respect. See generally, e.g., Nardone, 302 U.S. 379; United Slates Assistance to Countries that Shoot Down Civil Aircraft Involved in Drug Trafficking, 18 Op. O.L.C. 148 (1994); Application of Neutrality Act to Official Government Activities, 8 Op. O.L.C. 58 (1984).
7 - Section 1119 was designed to close a jurisdictional loophole-exposed by a murder that had been committed abroad by a private individual-to ensure the possibility of prosecuting U.S. nationals who murdered other U.S. nationals in certain foreign countries that lacked the ability to lawfully secure the perpetrator's appearance at trial. See 137 Cong. Rec. 8675-76 (1991) (statement of Sen. Thurmond). This loophole is unrelated to the sort of authorized operation at issue here. Indeed, prior to the enactment of section 1119, the only federal statute expressly making it a crime to kill U.S. nationals abroad (outside the United States' special and maritime jurisdiction) reflected what appears to have been a particular concern with the protection of Americans from terrorist attacks. See 18 U.S.C. § 2332(a), (d) (2006) (criminalizing unlawful killings of U.S. nationals abroad where the Attorney General or his subordinate certifies that the "offense was intended to coerce, intimidate, or retaliate against a government or a civilian population").
8 - 18 U.S.C. § 956(a)(1) (2006) makes it a crime to conspire within the jurisdiction of the United States "to commit at any place outside the United States an act that would constitute the offense of murder kidnapping or maiming if committed in the special maritime and territorial jurisdiction of the United States" if any conspirator acts within the United States to effect any object of the conspiracy. Like section 1119(b), section 956(a) incorporates the public authority justification. In addition, the legislative history of section 956(a) indicates that the provision was "not intended to apply to duly authorized actions undertaken on behalf of the United States Government" 141 Cong. Rec. 4491, 4507 (1995) (section-by-section analysis of bill submitted by Sen. Biden, who introduced the provision at the behest of the President); see also id. at 11,960 (section-by-section analysis of bill submitted by Sen. Daschle, who introduced the identical provision in a different version of the anti-terrorism legislation a few months later). Thus, for the reasons that section 1119(b) does not prohibit the United States from conducting a lethal operation against a U.s. citizen, section 956(a) also does not prohibit such an operation.
9 - See also Frye, 10 Cal. Rptr. 2d at 221 0.2 (identifying "homicide done under a valid public authority, such as execution of a death sentence or killing an enemy in a time of war," as examples of justifiable killing that would not be "unlawful" under the California statute describing murder as an "unlawful" killing); Model Penal Code § 3.03(2)(b), at 22 (proposing that criminal statutes expressly recognize a public authority justification for a killing that "occurs in the lawful conduct of war" notwithstanding the Code recommendation that the use of deadly force generally should be justified only if expressly prescribed by law).
10 - The statute also defines ''war crime" to include any conduct that is defined as a grave breach in any of the Geneva Conventions (or any Geneva protocol to which the United states is a party); that is prohibited by four specified articles of the Fourth Hague Convention of 1907; or that is a willful killing or infliction of serious injury in violation of the 1996 Protocol on Prohibitions or Restrictions on the Use of Mines, Booby-Traps and Other Devices. 18 U.S.C. § 2441(c).

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