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Staff Sgt. William Veal, 455th Expeditionary Logistics Readiness Squadron cryogenic technician, samples liquid nitrogen at Bagram Airfield, Afghanistan, May 20, 2011. Cryogenics supplies liquid oxygen and nitrogen which service the F-16 Strike Eagles. Sergeant Veal is deployed from Yokota Air Force Base, Japan and is a native of Warner Robins, Ga. (U.S. Air Force photo by Senior Airman Sheila deVera)
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