U.S. Air Force Airman 1st Class Kevin Maples, 20th Operational Support Squadron aircrew flight equipment apprentice assigned to the 77th Fighter Squadron works on an MBU-20P mask during a routine 30-day inspection, Shaw Air Force Base, S.C., Feb. 11, 2014. During an inspection of this sort, Maples checks for holes in the oxygen supply hose, ensures the batteries have a charge, and the microphones are fully functional. (U.S. Air Force photo by Airman 1st Class Jonathan Bass/Released)
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