150919-N-PO203-280 PATUXENT RIVER, Maryland (Sept. 19, 2015) Dr. Douglas Horner, right, and Lt. Peter Tydingco, from the Naval Postgraduate School, retrieve a REMUS 100 autonomous underwater vehicle (AUV) during the Office of Naval Research-sponsored demonstration of unmanned undersea vehicles (UUV) at Naval Air Station Patuxent River, Md. The event, PAX River 2015, brings 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)