779th AMDS preps Airmen for flight
Civilian and military students await the beginning of their altitude training course while inside an enclosed chamber March 16, 2017, at Joint Base Andrews, Md. All were undergoing refresher training, required every five years, to test their ability to identify how their bodies reacted in an environment with varying levels of air pressure. (U.S. Air Force photo by Staff Sgt. Joe Yanik)

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Photo by: Staff Sgt. Joe Yanik |  VIRIN: 170316-F-DO192-039.JPG