U.S. Air Force Staff Sgt. David Humphreys, a jet engine mechanic assigned to the 6th Aircraft Maintenance Squadron, inspects an engine mount bolt on a KC-135 Stratotanker aircraft at MacDill Air Force Base, Fla., Aug. 22, 2017. This type of inspection is a one-time verification across the fleet to ensure the aircraft is serviceable, as these bolts hold the engine onto the wing of the aircraft. (U.S. Air Force photo by Airman 1st Class Ashley Perdue)
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