Tech. Sgt. John Perez, left, 51st Maintenance Squadron propulsion section lead technician, provides oversight to Staff Sgt. Tristan Davis, 51st Aircraft Maintenance Squadron aerospace propulsion craftsman, as he prepares to tighten an A-10 Thunderbolt II engine onto the aircraft’s engine mount at Osan Air Base, Republic of Korea, Feb. 28, 2014. Aerospace propulsion specialists from the 51st MXS ensure A-10 engines are in first-rate operational condition. (U.S. Air Force photo/Senior Airman Siuta B. Ika)
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