150919-N-PO203-146 PATUXENT RIVER, Maryland (Sept. 19, 2015) Chad Burghardt, from the Space and Naval Warfare Systems Center Pacific, operates a Mk 18 Mod 2 Small Synthetic Aperture Minehunter (SSAM) unmanned undersea vehicle (UUV) during the Office of Naval Research-sponsored demonstration at Naval Air Station Patuxent River, Md., Sept. 12-25. The event, PAX River 2015, brought together 150 participants, 26 technology teams and unmanned systems to jointly explore UUV technologies in common, at-sea environments. (U.S. Navy photo by John F. Williams/Released)