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Staff Sgt. Yair Rubinov, 375th Logistics Readiness Squadron fuels distribution noncommissioned officer in charge, brushes frost off of an extension pipe connected to a liquid oxygen tank during a delivery process on April 17, 2019, at Scott Air Force Base, Ill. Liquid oxygen is used to provide clean oxygen to pilots and anyone on an aircraft above 10,000 feet and temperatures of -279 degrees fahrenheit. (U.S. Air Force photo by Senior Airman Daniel Garcia)
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