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 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 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 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. See Michael N. Schmitt, State-Sponsored Assassination in International and Domestic Law, 17 Yale J. Int’l 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 (200); see also Testimony of Attorney-General Lord Goldsmith, 660 Hansard. H.L. (April 21, 2004) 370 (U.K.), available at (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.

By its nature, therefore, the threat posed by al-Qa’ida and its associated forces demands a broader concept of imminence in judging when a person continually planning terror attacks presents an imminent threat, making the use of force appropriate. In this context, imminence must incorporate considerations of the relevant window of opportunity, the possibility of reducing collateral damage to civilians, and the likelihood of heading off future disastrous attacks on Americans. Thus, a decision maker