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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 law of armed conflict”).

The fact that an operation may target a U.S. citizen does not alter 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.

IV.

The War Crimes Act, 18 U.S.C. § 2441 (2006) makes it a federal crime for a member of the Armed Forces or a national of the United States to “commit[] a war crime.” Id. § 2441(a). The only potentially applicable provision of section 2441 to operations of the type discussed herein makes it a war crime to commit a “grave breech” of Common Article 3 of the Geneva Conventions when that breach is committed “in the context of and in association with an armed conflict not of an international character.”[1]


  1. 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

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