Capt. Julianne Gillespie, 62nd Airlift Wing aerospace and operational physiologist, checks the breathing of Airman 1st Class Erich Held, 62nd Medical Squadron optometry technician, doubling as a pilot using the Reduced Oxygen Breathing Device at the McChord Field clinic, Feb. 5, 2014 at Joint Base Lewis-McChord, Wash. The ROBD will ultimately replace the more expensive altitude chamber for the required re-fresher training aircrew needs every five years. (U.S. Air Force photo/Tech. Sgt. Sean Tobin)
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