Airman 1st Class Thomas Overley, 757th Aircraft Maintenance Squadron Strike Aircraft Maintenance Unit aerospace propulsion specialist, performs an engine borescope inspection on an F-15E Strike Eagle on the flightline at Nellis Air Force Base, Nev., Aug. 19, 2015. Aerospace propulsions specialists help ensure that the aircraft's engine is in operational condition. (U.S. Air Force photo by Airman 1st Class Mikaley Towle)
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