Planet Earth
U.S. Air Force MASTER SGT. Richard Burden, 126th Petroleum, Oils, and Lubricants, Scott Air Force Base, Ill., demonstrates the procedures for testing the water density of fuel to U.S. Army Soldiers with the 634th Forward Support Battalion, Sullivan, Ill., on Sept. 25, 2004. (U.S. Air Force photo by Technical Sergeant Mike Rice) (Released)

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