160518-N-PO203-136 NATIONAL HARBOR, Md. (May. 18, 2016) Cmdr. Carl Carney, a reserve engineering duty officer, and railgun lab operations manager-engineer at the Naval Research Laboratory (NRL), talks with attendees during the 2016 Sea-Air-Space Exposition. Sea-Air-Space is hosted by the Navy League of the United States with the goal of bringing together leaders from defense organizations, both government and private industry, to learn about and view the most up-to-date information and technology related to maritime policy. (U.S. Navy photo by John F. Williams/Released)