Staff Sgt. Chris Bates, 455th ELRS fuels laboratory NCO in charge, takes a fuel sample for testing on Bagram Airfield, Afghanistan, Feb. 21, 2013. The fuel must be tested daily for contraction or expansion due to the weather, which affects the net amount of fuel available for aircraft. (U.S. Air Force photo/Staff Sgt. David Dobrydney)
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