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Liquid oxygen
Fuel management technicians assigned to the 139th Logistics Readiness Squadron, Missouri Air National Guard, load liquid oxygen into a 50 gallon tank June 7, 2015 at Rosecrans Air National Guard Base, St. Joseph, Mo. The liquid oxygen, or LOX, is used in aircraft to provide oxygen to crew and passengers. (U.S. Air National Guard photo by Senior Airman Sheldon Thompson)