Airman 1st Class Lindsy Hall, 60th Operations Support Squadron aircrew flight equipment apprentice, runs a series of tests over Staff Sgt. Chris Sabelky's, 21st Airlift Squadron, oxygen mask. The test included simulations of varying altitudes to ensure the mask was safe and functioning at any elevation. (U.S. Air Force photo/Airman 1st Class Madelyn Brown)
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