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During the past decades operations in Afghanistan and Iraq, the U.S. military has come to rely heavily on the continuous or nearly continuous presence overhead of both manned and unmanned aircraft to support ground troops. Unmanned aircraft that remain aloft in particular locations (or orbits) have been primarily used to provide timely information about activities on the ground and to attack ground targets on short notice. Most prominent among these aircraft are the Department of Defense's (DoD's) fleets of unmanned Predators, Reapers, and Global Hawks; however, satellites and manned conventional aircraft, including fighters and long-range bombers, have also contributed. The demand for those so-called persistent or loitering missions has led the Air Force to substantially enlarge its fleet of unmanned aircraft, and the Army, Navy, and Marine Corps to field or plan to field similar aircraft to provide intelligence, surveillance, and reconnaissance (ISR) and light-attack capabilities of their own. Unmanned aircraft are particularly attractive for such missions because they can be designed to provide durations beyond the physical endurance of human air crews and because they do not put humans at risk during operations in potentially hostile airspace.