Senior Airman Kristin Listien, a physiology technician (PT) assigned to the 19th Aerospace Medicine Squadron High Altitude Airdrop Mission Support Center (HAAMSOC), Little Rock Air Force Base, Ark., prepares for a static-line parachute jump, Nov. 16, 2016. Listien is part of the HAAMS mission where Airmen are specially trained to provide in-flight physiological support to aircrews, special operations forces, high-altitude parachutists, and other DoD agencies that perform unpressurized airdrop operations at 20,000 feet mean sea level and above. (U.S. Air Force photo/Staff Sgt. Kenny Holston)