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Tech. Sgt. David Bordeaux, 22nd Expeditionary Air Refueling Squadron NCO in charge of aircrew flight equipment, performs an operational check on a pilot's oxygen mask March 23, 2013, at Transit Center at Manas, Kyrgyzstan. The KC-135 Stratotanker typically has six aircrew oxygen masks which must be inspected on a regular basis. (U.S. Air Force photo/Staff Sgt. Christopher Heller)
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