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U.S. Air Force Tech. Sgt. Christopher Phillips, a communication systems operator assigned to the 310th Airlift Squadron, tests the phone systems during a pre-flight inspection at MacDill Air Force Base, Fla., May 5, 2017. Pre-flight inspections are done before every flight to ensure the aircraft is ready to fly. (U.S. Air Force photo by Airman 1st Class Mariette Adams)
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