ROBINS AIR FORCE BASE, Ga. – Capt. Pierre Nelson, Aerospace and Operational Physiology Flight commander with the 461st Operations Support Squadron, uses the Reduced Oxygen Breathing Device at Robins Air Force Base, Georgia, Jan. 24, 2020. The flight uses the ROBD to train aircrew members on the dangers of hypoxia in a safe environment. (U.S Air Force photo by Joseph Mather)