(pp.6-8)
The United States has not historically limited the use of military force to conflicts with nation-states:
[A] number of prior authorizations of force have been directed at non-state actors, such as slave traders, pirates, and Indian tribes. In addition, during the Mexican-American War, the Civil War, and the Spanish-American War, U.S. military forces engaged military opponents who had no formal connection to the state enemy. Presidents also have used force against non-state actors outside of authorized conflicts.
Curtis A. Bradley & Jack L. Goldsmith, Congressional Authorization and the War on Terrorism, 118 Harv. L. Rev. 2047, 2066-67 (2005) (citing U.S. use of military force in the Chinese Boxer Rebellion, against the Mexican rebel leader Pancho Villa, and in the 1998 cruise missile attacks against al-Qaida targets in Sudan and Afghanistan).
Thus, consistent with U.S. historical practice, and international law, the AUMF authorizes the use of necessary and appropriate military force against members of an opposing armed force, whether that armed force is the force of a state or the irregular forces of an armed group like al-Qaida. Because the use of force includes the power of detention, Hamdi, 542 U.S. at 518, the United States has the authority to detain those who were part of al-Qaida and Taliban forces. Indeed, long-standing U.S. jurisprudence, as well as law-of-war principles, recognize that members of enemy forces can be detained even if “they have not actually committed or attempted to commit any act of depredation or entered the theatre or zone of active military operations.” Ex parte Quirin, 317 U.S. at 38; Khalid v. Bush, 355 F. Supp. 2d 311, 320 (D.D.C. 2005), rev’d on other grounds sub nom., Boumediene v. Bush, 128 S. Ct. 2229 (2008); see also Geneva Convention (III) Relative to the Treatment of Prisoners of War of Aug. 12, 1949, art. 4, 6 U.S.T.S. 3316 (contemplating detention of members of state armed forces and militias without making a distinction as to whether they have engaged in combat). Accordingly, under the AUMF as informed by law-of-war principles, it is enough that an individual was part of al-Qaida or Taliban forces, the principal organizations that fall within the AUMF’s authorization of force.
Moreover, because the armed groups that the President is authorized to detain under the AUMF neither abide by the laws of war nor issue membership cards or uniforms, any determination of whether an individual is part of these forces may depend on a formal or functional analysis of the individual’s role. Evidence relevant to a determination that an individual joined with or became part of al-Qaida or Taliban forces might range from formal membership, such as through an oath of loyalty, to more functional evidence, such as training with al-Qaida (as reflected in some cases by staying at al-Qaida or Taliban safehouses that are regularly used to house militant recruits) or taking positions with enemy forces. In each case, given the nature of the irregular forces, and the practice of their participants or members to try to conceal their affiliations, judgments about the detainability of a particular individual will necessarily turn on the
totality of the circumstances.
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