Air Force Senior Master Sgt. Paul Johal, School of Aerospace Medicine operational physiology superintendent, briefs students in the altitude hypobaric chamber about familiarizing themselves with the oxygen equipment for USAFSAM hypoxia demo training at Wright-Patterson Air Force Base, Ohio, April 26, 2017. The hypobaric chamber provides a training system which replicates the effects of barometric pressure change on the human body.

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