U.S. Air Force Senior Airman Guy Kopp, 355th Component Maintenance Squadron aerospace propulsion journeyman, replaces a component in an engine at Davis-Monthan Air Force Base, Ariz., August 14, 2013. After engines are fixed, they are run outside the aircraft to make sure they function properly and nothing else needs to be replaced. (U.S. Air Force photo by Airman 1st Class Betty R. Chevalier/Released)
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