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Service members train for high altitudes
U.S. Army Rangers prepare to go through a rapid decompression test inside a hypobaric altitude chamber at Langley Air Force Base, Va., Nov. 14, 2014. The rapid decompression test simulates how it would feel if an aircraft window or door flew off in flight. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

Photo by: Staff Sgt. Natasha StannardReleased  |  VIRIN: 141114-F-GX122-210.JPG