Senior Airman Brandon Avery, a cryogenics technician with the 18th Logistics Readiness Squadron, seals a sample of liquid oxygen Aug. 17, 2016, at Kadena Air Base, Japan. Liquid oxygen is used primarily for aircraft so pilots can breathe, as well as for patients on oxygen during things like emergency evacuation flights. (U.S. Air Force Photo by Airman 1st Class Nick Emerick)
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