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Service members train for high altitudes
U.S. Air Force Senior Airman Francia Bienvue, 633rd Aerospace Medicine Squadron physiology technician, dons her mask before going through a rapid decompression test with high-altitude training students in a hypobaric altitude chamber at Langley Air Force Base, Va., Nov. 14, 2014. Students go through a series of tests that bring on hypoxia and add pressure to sinus cavities. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

Photo by: Staff Sgt. Natasha StannardReleased  |  VIRIN: 141114-F-GX122-255.JPG