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U.S. Air Force Lt. Col. Matthew Yaun, a pilot assigned to the 300th Airlift Squadron, conducts aerial operations during a training flight onboard a C-17 Globemaster III near Joint Base Charleston, S.C., Sept. 8, 2014. Training flights are vital to the operational success of Air Force personnel because they help develop the necessary skills for combat and humanitarian missions. (U.S. Air Force photo by Tech. Sgt. Barry Loo/released)