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Service members train for high altitudes
U.S. Army Rangers get used to breathing in their oxygen masks before going through a series of tests in a hypobaric altitude chamber at Langley Air Force Base, Va., Nov. 14, 2014. The chamber reduces pressure around students to create low pressure environments, which are experienced in high altitude. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)

Photo by: Staff Sgt. Natasha StannardReleased  |  VIRIN: 141114-F-GX122-059.JPG