Senior Airman Shanna Thomas, 779th Aerospace Medicine Squadron aerospace physiology technician, performs an operation check on life support equipment in the hypobaric chamber here Nov. 2. The Aerospace and Operational Physiology Training Flight uses the hypobaric chamber to train military, Department of Defense civilians and contractors on the effects of hypoxia, how to recognize their personal symptoms of hypoxia, and make the necessary corrections to reverse the symptoms of the condition. (U.S. Air Force photo/Senior Airman Perry Aston)