Airman 1st Class William Ensrud
Airman 1st Class William Ensrud, an aerospace physiology technician with the 71st Medical Operations Squadron, stands with a Barany chair at Vance Air Force Base, Okla. Ensrud teaches student pilot egress procedures, the use of aircraft life support equipment, how to cope with high-altitude conditions, parachute landing falls and air sickness prevention. (U.S. Air Force photo/Senior Airman Frank Casciotta)