Staff Sgt. James Gardner and Mr. Ki-Hyon Pak, with the 51st Logistics Readiness Squadron, push liquid oxygen into a beaker to perform an odor test here, April 9, 2012. An odor test is one way to test if the liquid oxygen is still in good quality. Gardner is a 51st LRS fuels cryogenic technician and Pak is a cryogenics operator. (U.S. Air Force photo/Staff Sgt. Craig Cisek)
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