U.S. Army Gen. Martin E. Dempsey, center, the chairman of the Joint Chiefs of Staff, listens to a U.S. sailor discuss the control room aboard the ballistic missile submarine USS Maine (SSBN 741) in the waters off Bangor, Wash., Oct. 3, 2012. Dempsey toured the submarine while visiting the Pacific Northwest. (U.S. Navy photo by Chief Mass Communication Specialist Ahron Arendes/Released)