EXPERIMENTAL BOAT U.S. Navy sailors conduct maneuvers aboard a Riverine Command Boat, Experimental RCB-X, on Naval Station Norfolk, Va., Oct. 21, 2010. The experimental boat is powered by an alternative fuel blend of 50 percent algae-based and 50 percent NATO F-76 fuels to support the Navy secretary's efforts to reduce total energy consumption on naval ships. The sailors are assigned to Riverine Group 1. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 155130-P-RHF30-662.jpg Photo Gallery