“ The Department has not found any authority for the proposition that when one of the parties to an armed conflict plans and executes operations from a base in a new nation, an operation to engage the enemy in that location cannot be part of the original armed conflict, and thus subject to the laws of war governing that conflict, unless the hostilities become sufficiently intense and protracted in the new location. ”

“ Particularly in a non-international armed conflict, where terrorist organizations may move their base of operations from one country to another, the determination of whether a particular operation would be part of an ongoing armed conflict would require consideration of the particular facts and circumstances in each case, including the fact that transnational non-state organizations such as al-Qa’ida may have no single site serving as their base of operations. ”

“ In some instances, therefore, the best interpretation of a criminal prohibition is that Congress intended to distinguish persons who are acting pursuant to public authority from those who are not, even if the statute does not make that distinction express. ”

“ Consequently, with respect to al-Qa’ida leaders who are continually planning attacks, the United States is likely to have only 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 casualties. ”

“ 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. ”

“ Moreover, a lethal operation in a foreign nation 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. ”

“ 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. ”

“ But the generally recognized public authority justification reflects that it would not make sense to attribute to Congress the intent to criminalize all covered activities undertaken by public officials in the legitimate exercise of their otherwise lawful authorities, even if Congress clearly intends to make those same actions a crime when committed by persons not acting pursuant to public authority. ”

“ 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) . ↑ 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) ”

“ 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.”) ”