John Delfs, 57th Maintenance Group Propulsion Shop contractor aerospace propulsion mechanic, conducts a clutch and brake disassembly inspection on a Pratt & Whitney F100 engine central gear box Nov. 7, 2013, at Nellis Air Force Base, Nev. The central gear box for an F-15 Eagle is designed to start the motor of the aircraft. The 57th MXG Propulsion Shop is responsible for the maintenance of 185 aircraft engines. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)
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