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U.S. Air Force Staff Sgt. Jeffrey Jin, a 354th Maintenance Squadron aerospace propulsion craftsman, helps prepare an F-16 Fighting Falcon aircraft for the engine to be removed Aug. 12, 2016, during RED FLAG-Alaska 16-3, in the phase shop at Eielson Air Force Base, Alaska.This engine is being pulled so that the Joint Service Electrical Combat Systems Tester can be replaced. (U.S. Air Force photo by Airman Isaac Johnson)