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Master Sgt. Virginia McDonough assists a pilot from the 100th Operations Group during simulated hypoxia training Sept. 17, 2014, at Royal Air Force Station Lakenheath, England. Hypoxia is a condition in which the tissues of the body don’t receive enough oxygen, causing loss of consciousness. Hypoxia training helps pilots recognize the signs and symptoms of the condition and teaches them how to avoid it before encountering the adverse effects. McDonough is the 48th Aerospace Medical Squadron flight chief of operational physiology. (U.S. Air Force photo/Airman 1st Class Erin O’Shea)