U.S. Air Force Staff Sgt. Keith Perry, 9th Air Refueling Squadron KC-10 Extender flight engineer, enters a KC-10 from the 60th Air Mobility Wing after performing a pre-flight inspection before a training sortie at Travis Air Force Base, California, Nov. 26, 2018. Travis Airmen conduct training events to stay current and be prepared for future mobility operations. (U.S. Air Force Photo by Master Sgt. Joey Swafford)
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