High Altitude Parachute Class PB
                Staff Sgt. Adam Tyler operates the lock chamber Nov. 2, 2010, at the aerospace physiology building at Shaw Air Force Base, S.C. The high altitude parachute class focuses on human performance at high altitudes and high-stress levels. Students take this class before freefall school and as a refresher course every five years. Sergeant Tyler is an aerospace and operational physiologist technician with the 20th Aerospace Medicine Squadron (U.S. Air Force photo/ Airman 1st Class Tabatha L. Duarte)
                
                    
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