Into thin air: liquid oxygen keeps pilots flying
Senior Airmen Ferral Ceaser (left) and Kevin Hakala, 36th Maintenance Squadron electrical and environmental technicians, push a liquid oxygen cart for transportation, Dec. 1, 2015, at Andersen Air Force Base, Guam. After inspecting the cart, the team takes the cart to cryogenics to be filled with liquid oxygen. (U.S. Air Force photo/Senior Airman Cierra Presentado)

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