150413-N-PO203-051 NATIONAL HARBOR, Md. (April 13, 2015) Cmdr. Carl Carney, from the Naval Research Laboratory (NRL), talks to visitors at the joint Office of Naval Research, NRL and Marine Corps Warfighting Laboratory exhibit during the Navy League's 50th annual Sea-Air-Space Exposition. (U.S. Navy photo by John F. Williams/Released)