LAS VEGAS, Nev. – An MQ-1 Predator and MQ-9 Reaper prepare for takeoff on the Creech Air Force Base, Nev., flightline July 18, 2013. Both aircraft are armed, multi-mission, medium-altitude, long-endurance remotely piloted aircraft that are employed primarily as intelligence-collection asset aircraft, with the ability to respond to changing mission requirements. (U.S. Air Force photo by Staff Sgt. A.D./RELEASED)