Senior Airman Brett Schindler, U.S. Air Force Weapons School air crew flight equipment journeyman, sanitizes an oxygen mask, April 12, 2013, at Nellis Air Force Base, Nev. Life support maintains flight equipment; such as flight helmets, oxygen masks and survival kits. (U.S. Air Force photo/Senior Airman Brett Clashman)
Senior Airman Brett Clashman
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