150414-N-PO203-076 NATIONAL HARBOR, Md. (April 14, 2015) Rear Adm. Mat Winter, chief of naval research, holds a press conference at the joint Office of Naval Research (ONR), Naval Research Laboratory, and Marine Corps Warfighting Laboratory exhibit during the Navy League's 50th annual Sea-Air-Space Exposition. Winter talked about various ONR technologies on display during the exposition including the Large Displacement Unmanned Undersea Vehicle-Innovative Naval Prototype, Low-Cost Unmanned Aerial Vehicle Swarming Technology, Ground-Based Air Defense On-the-Move and the ONR's Medium Displacement Unmanned Surface Vehicle. (U.S. Navy photo by John F. Williams/Released)