U.S. Air Force Pilots from the 37th Flying Training Squadron undergo hypobaric chamber training Dec. 7, 2020, on Columbus Air Force Base, Miss. The training, provided by the 14th Operations Support Squadron aerospace physiology technicians, is used as a simulation for pilots to feel the effects of high altitude on the human body, such as hypoxia. (U.S. Air Force photo by Airman 1st Class Jessica Williams)