150922-N-PO203-051 PATUXENT RIVER, Maryland (Sept. 22, 2015) Dr. Jason Stack, right, a program officer for the Office of Naval Research (ONR) ocean battlespace sensing department, reviews data collected by the University of Texas at Austin during an ONR-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)