Senior Airman Earnest Powell, a physiology technician (PT) assigned to the 19th Aerospace Medicine Squadron High Altitude Airdrop Mission Support Center, Little Rock Air Force Base, Ark., participates in a high-altitude mission, Nov. 16, 2016. PTs are responsible for ensuring aircrew are receiving proper amounts of oxygen while flying at altitudes above 20,000 feet. (U.S. Air Force photo/Staff Sgt. Kenny Holston)
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