In this photo released by the U.S. Navy, sailors assigned to Riverine Group 1 conduct maneuvers aboard Riverine Command Boat (Experimental) (RCB-X) at Naval Station Norfolk, Va., on Friday. The RCB-X is powered by an alternative fuel blend of 50 percent algae-based and 50 percent NATO F-76 fuels to reduce total energy consumption on naval ships.
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