Staff Sgt. Mario Shanks, the 379th Expeditionary Logistics Readiness Squadron fuels laboratory NCO in charge, checks fuel density with a hydrometer at Al Udeid Air Base, Qatar, Feb. 14, 2017. Shanks conducted an American Petroleum Institute specific gravity test on a sample of fuel to determine the density of the fuel which helps them track how much is used. (U.S. Air Force photo/Senior Airman Miles Wilson)
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