AFSOUTH EMEDS: Light, lean and life saving
Members of the Brazilian air force give a brief presentation to U.S. Air Force members explaining the use and operation of their hypobaric chamber, April 20, 2015 in Rio de Janeiro, Brazil. The chamber simulates a high altitude environment and helps illustrate the effects of hypoxia on the human body. (U.S. Air Force photo by Staff Sgt. Adam Grant/Released)

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Photo by: Staff Sgt. Adam GrantReleased |  VIRIN: 150420-F-HZ705-006.JPG