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A U.S. Air Force MQ-9 Reaper taxis in for a warm refuel test, where the aircraft is grounded and refueled while powered on but with the engine not running, at Creech Air Force Base, Nevada, Sept. 2, 2021. Warm refuels can increase the MQ-9’s operational agility through reducing turnaround time on the ground. (U.S. Air Force photo by Tech. Sgt. Emerson Nuñez)