U.S. Air Force Brig. Gen. Edward Vaughan, the Air Force Physiological Episodes Action Team lead, experiences how Airmen at the 1st Fighter Wing's Aerospace and Operational Physiology Training Flight use a reduced oxygen breathing device as part of their physiological training March 28, 2019, at Joint Base Langley-Eustis, Virginia. Vaughan and his team met at the NASA Engineering and Safety Center to analyze F/A-18 and F-15 liquid-oxygen-configured NASA aircraft to better understand the causes of physiological episodes in the Navy and Air Force. (Courtesy Photo)