150205-N-PO203-387 WASHINGTON (Feb. 5, 2015) Vice Adm. Philip Cullom, deputy chief of Naval Operations for Fleet Readiness and Logistics, discusses the Naval electromagnetic railgun with Roger Ellis, a program officer in the Office of Naval Research air warfare and naval weapons department, during the Naval Future Force Science and Technology Expo. (U.S. Navy photo by John F. Williams/Released)