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Capt. Julianne Gillespie, 62nd Airlift Wing aerospace and operational physiologist, validates how she can monitor an aircrew member’s pulse and oxygen saturation in their blood while being tested with the Reduced Oxygen Breathing Device at the McChord Field clinic, Feb. 5, 2014 at Joint Base Lewis-McChord, Wash. The ROBD allows aircrew members to experience hypoxia while flying. (U.S. Air Force photo/Tech. Sgt. Sean Tobin)
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