Capt. Irena Farlik,60th Medical Operations Squadron aerospace and operational physiologist, and Master Sgt. Keith Ravenel, 60th Medical Operations Squadron aerospace physiology technician, demonstrate the process in which aircrew members utilize the Reduced Oxygen Breathing Device/Hypoxia Familiarization Trainer, July 8, 2015, as part of mandatory refresher physiology training at Travis Air Force Base, California. (U.S. Air Force photo by Senior Airman Charles Rivezzo)
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