ARSENAL
Shortly after 2:00 a.m. local time on June 4, 1972, just a few miles off the North Vietnamese coast, U.S. Navy Lt. Melvin S. Dry and three naval special warfare personnel departed the USS (LPSS-574) aboard a Mark VII Swimmer Delivery Vehicle (CGN-9), the command ship for Operation Thunderhead, America’s last POW rescue attempt of the Vietnam War. The Mark VII SDV lacked the power and endurance to overcome the currents and sea condition. Operation Thunderhead was aborted.