150921-N-PO203-305 PATUXENT RIVER, Maryland (Sept. 21, 2015) Dr. Douglas Horner, right, a professor at the Naval Postgraduate School, confers with students, Ens. Eric Bermudez, center, and Lt. Peter Tydingco, 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)