Airman 1st Class Erich Held, 62nd Medical Squadron optometry technician demonstrates how pilots would use the Reduced Oxygen Breathing Device at the McChord Clinic, Feb. 5, 2014, Joint Base Lewis-McChord, Wash. The ROBD is combined with a flight simulator that can change its heads up display to match the specific aircraft the training pilot flies. (U.S. Air Force photo/Tech. Sgt. Sean Tobin)
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