U.S. Air Force Airman 1st Class Richard Hubbard and Senior Airman Nicholas McGinnis, 31st Logistics Readiness Squadron fixed facilities personnel, disperse liquid oxygen into a tank, April 23, 2015, at Aviano Air Base, Italy. Liquid oxygen is necessary for pilots while flying at high altitudes. (U.S. Air Force photo by Senior Airman Matthew Lotz/Released)
Senior Airman Matthew Lotz
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