Staff Sgt. Nathan Knight, 455th Expeditionary Logistics Readiness Squadron cryogenics supervisor, opens a valve on a 400-gallon liquid oxygen tank, Bagram Airfield, Afghanistan, Sept. 14, 2016. Cryogenics Airmen work with liquid nitrogen and liquid oxygen that is stored into aircraft, providing aircrews with pure oxygen at altitude during missions in support of Operation Freedom’s Sentinel. (U.S. Air Force photo by Senior Airman Justyn M. Freeman)
Contributor:AB Forces News Collection / Alamy Stock Photo
File size:54.2 MB (2.1 MB Compressed download)
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Dimensions:5148 x 3677 px | 43.6 x 31.1 cm | 17.2 x 12.3 inches | 300dpi
Date taken:14 September 2016
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