Master Sgt. Joe Feiss, 455th Expeditionary Logistics Readiness Squadron petroleum, oils and lubricants lead supervisor, holds a beaker with liquid oxygen at Bagram Airfield, Afghanistan, Nov. 27, 2018. Liquid oxygen converts to breathable oxygen allowing aircrew to safely operate at high altitudes. (U.S. Air Force photo by Senior Airman Kaylee Dubois)
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