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Airman 1st Class Brittany McBee, 47th Medical Operations Squadron aerospace physiology technician, performs an operation check on life support equipment in the hypobaric chamber at the Aerospace Physiology Unit on Laughlin Air Force Base, Texas, April 30, 2014. The Aerospace Physiology Unit uses the hypobaric chamber to train military, Department of Defense civilians and contractors on the effects of hypoxia, how to recognize their personal symptoms of hypoxia and make the necessary corrections to reverse the symptoms of the condition. (U.S. Air Force photo/Airman 1st Class Ariel D. Delgado/Released)