Underwater Demolition Team

The Underwater Demolition Teams (UDT) were an elite special-purpose force established by the United States Navy during World War II. They also served during the Korean War and the Vietnam War. Their primary function was to reconnoiter and destroy enemy defensive obstacles on beaches prior to amphibious landings. They also were the frogmen who retrieved astronauts after splashdown in the Mercury through Apollo manned space flight programs.