Staff Sgt. Allen Smith (seated) and Tech. Sgt. Steve McShane, both 19th Aerospace Medicine Squadron physiology technicians, demonstrate an oxygen bottle replacement for Lt. Gen. Darren McDew, 18th Air Force commander, during his visit to Little Rock Air Force Base, Ark., Nov. 6, 2012. Bottle replacement is one of several duties physiology technicians perform in flight to support aircrew members. (U.S. Air Force photo/Staff Sgt. Russ Scalf)
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Staff Sgt. Russ Scalf
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