Senior Airman Deaja Ellis, 359th Aerospace Medicine Squadron aerospace and operational physiology technician, instructs aviators-in-training on correct oxygen mask procedures Jan. 28, 2020 at Joint Base San Antonio-Randolph, Texas. Members of the aerospace and operational physiology training unit use a hypobaric chamber to teach pilots and aircrew members about the effects of altitude on the human body. (U.S. Air Force photo by Tech. Sgt. Katherine Spessa)

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