The AUMF authorizes the President to use "all necessary and appropriate force" against "nations, organizations, or persons" associated with the September 11, 2001, terrorist attacks. 115 Stat. 224. There can be no doubt that individuals who fought against the United States in Afghanistan as part of the Taliban, an organization known to have supported the al Qaeda terrorist network responsible for those attacks, are individuals Congress sought to target in passing the AUMF. We conclude that detention of individuals falling into the limited category we are considering, 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 has authorized the President to use.
The capture and detention of lawful combatants and the capture, detention, and trial of unlawful combatants, by "universal agreement and practice," are "important incident of war." Ex parte Quirin, supra, at 28, 30. The purpose of detention is to prevent captured individuals from returning to the field of battle and taking up arms once again. Naqvi, Doubtful Prisoner-of-War Status, 84 Int'l Rev. Red Cross 571, 572 (2002) ("[C]aptivity in war is `neither revenge, nor punishment, but solely protective custody, the only purpose of which is to prevent the prisoners of war from further participation in the war'" (quoting decision of Nuremberg Military Tribunal, reprinted in 41 Am. J. Int'l L. 172, 229 (1947)); W. Winthrop, Military Law and Precedents 788 (rev. 2d ed. 1920) ("The time has long passed when `no quarter' was the rule on the battlefield. . . . It is now recognized that `Captivity is neither a punishment nor an act of vengeance,' but `merely a temporary detention which is devoid of all penal character.' . . . `A prisoner of war is no convict; his imprisonment is a simple war measure'" (citations omitted)); cf. In re Territo, 156 F. 2d 142, 145 (CA9 1946) ("The object of capture is to prevent the captured individual from serving the enemy. He is disarmed and from then on...