Cryogenics make it easy to breathe

Senior Airman Seth Bruning, 86th Logistics Readiness Squadron hydrants technician, pushes a liquid oxygen tank on Ramstein Air Base, Germany, Sept. 3, 2014. The 50-gallon, liquid oxygen tank is used as breathing oxygen for aircrew members during missions when brought to room temperature. (U.S. Air Force photo/Airman 1st Class Michael Stuart)

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