UDT 21

Underwater Demolition Team 21 (UDT 21) was a specialized unit of the United States Navy, established during World War II to conduct amphibious reconnaissance, obstacle clearance, and demolition missions in the Pacific Theater. UDT 21 distinguished itself in major operations, including the Normandy landings (D-Day) and the invasions of Iwo Jima and Okinawa. After the war, the team continued to evolve, taking on new missions during the Korean War and the early Cold War period. UDT 21 played a foundational role in the development of Naval Special Warfare, and its legacy lives on as it was eventually integrated into the U.S. Navy SEALs with the establishment of SEAL Team TWO in 1962.