Chief Master Sgt. Vincent Alois, 512th Maintenance Group superintendent, signs General Electric TF-39 turbofan engine 411052 before its final departure Feb. 16, 2018, at Dover Air Force Base, Del. Since 1971, Airmen at the Jet Engine Intermediate Level Maintenance shop maintained the TF-39 engines from across the Air Force. (U.S. Air Force photo by Staff Sgt. Aaron J. Jenne)
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