150728-N-AC887-003 MCLEAN, Va. (July 28, 2015) Secretary of the Navy (SECNAV) Ray Mabus delivers remarks during the 2015 Directed Energy Summit in Mclean, Va. Mabus spoke about the role the Department of the Navy has in energy innovation, as well as the broader relationship between energy and national security. (U.S. Navy photo by Chief Mass Communication Specialist Sam Shavers/Released)