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Tech. Sgt. Corey Briggs (right), 455th Expeditionary Logistics Readiness Squadron cryogenics, and Staff Sgt. Nathan Knight (left), 455th Expeditionary Logistics Readiness Squadron cryogenics supervisor, handle a sample of liquid oxygen, Bagram Airfield, Afghanistan, Sept. 14, 2016. Once the sample is collected, cryogenics technicians perform an odor test to ensure the liquid oxygen is good for use. (U.S. Air Force photo by Senior Airman Justyn M. Freeman)
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