Into thin air: liquid oxygen keeps pilots flying
Senior Airman Kevin Hakala, 36th Maintenance Squadron electrical and environmental technician, attaches a liquid oxygen cart to a truck before taking it to the cryogenics shop to be filled Dec. 1, 2015, at Andersen Air Force Base, Guam. Before the cart goes to an aircraft, the team ensures they are free of discrepancies and filled with liquid oxygen. (U.S. Air Force photo/ Senior Airman Cierra Presentado)

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