Liquid Fuels
U.S. Air Force Staff Sgt. Daniel Huffstetler, the 509th Civil Engineer Squadron water and fuels systems maintenance supervisor, adjusts the rate of flow for filter separators at Whiteman Air Force Base, Mo., Feb. 12, 2016. Unlike other systems, the Type 5 fueling system allows the B-2 Spirit to be fueled inside the hangar; this provides the B-2 with a strategic advantage. (U.S. Air Force photo by Airman 1st Class Michaela R. Slanchik)

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