160407-N-PO203-374 PORTLAND, Ore. (Apr. 7, 2016) Rear Adm. Mat Winter, chief of naval research, offers remarks during a christening ceremony for Sea Hunter, an entirely new class of unmanned ocean-going vessel during a ceremony held in Portland, Oregon. The Defense Advanced Research Projects Agency (DARPA) in conjunction with the Office of Naval Research (ONR) is working to fully test the capabilities of the vessel which is able to travel thousands of miles over the open seas for months at a time without a crew, and with a high degree of autonomy in operation. (U.S. Navy photo by John F. Williams/Released)