The Underwater Demolition Teams of the Pacific
The Underwater Demolition Teams of the Pacific played a crucial role in shaping modern amphibious warfare, paving the way for the elite US Navy SEALs. Born out of necessity during World War II, these fearless warriors conducted high-risk reconnaissance and demolition missions to ensure the success of amphibious landings in the Pacific Theater. Their legacy is one of courage, innovation, and sacrifice.
The Origins of Underwater Demolition Teams
During World War I, disastrous amphibious landings, like those at Gallipoli, highlighted the dangers of unprepared beach assaults. Determined to avoid repeating history, the US military spent years refining landing strategies. By the 1930s, new techniques were tested, but the urgent need for specialized underwater reconnaissance became apparent during the Battle of Tarawa in November 1943.
Naval landing craft struck unseen coral reefs, resulting in significant casualties. In response, Admiral Kelly Turner, Commander of the 5th Amphibious Force, assembled 180 men at Waimanalo Amphibious Training Base in Oahu to undergo specialized training. These men became the first Underwater Demolition Teams (UDTs), tasked with clearing obstacles and ensuring safe landings.
The Birth of the “Naked Warriors”
UDTs were formed with a clear mission: conduct underwater reconnaissance and remove man-made or natural barriers that could obstruct amphibious landings. Initially, they wore fatigues and used inflatable boats to navigate the waters. However, their first major operation at Kwajalein Atoll in January 1944 proved that traditional gear was impractical.
Two Seabees, Ensign Lewis F. Luehrs and Chief Bill Acheson, stripped down to their swim trunks and bravely swam across the reef to assess the landing conditions. Their success convinced Admiral Turner to train UDT members as expert swimmers. This shift led to the adoption of swim trunks, diving masks, and fins—earning them the nickname “Naked Warriors.”
Key Underwater Demolition Team Missions in the Pacific
Kwajalein – The Turning Point
After Tarawa’s costly errors, the invasion of Kwajalein Atoll became a critical test for the UDTs. Their successful reconnaissance under heavy enemy presence proved their value, shaping future operations and reinforcing their reputation as essential assets in amphibious warfare.
Peleliu, Guam, the Philippines, and Iwo Jima
As the war progressed, UDTs became instrumental in ensuring the success of major landings. In the lead-up to the Battle of Iwo Jima, UDT 15’s reconnaissance resulted in enemy fire, causing one casualty. Later, UDTs stationed on USS Blessman suffered a devastating air attack, losing 15 men and leaving 23 injured—the greatest loss of life in UDT history.
Despite these hardships, the UDTs cleared Iwo Jima’s beaches, ensuring safe troop landings and facilitating the US Marines’ historic assault on the island.
Okinawa – The Largest UDT Operation
The invasion of Okinawa required the most extensive UDT operation of the war. Nearly 1,000 men from UDTs 7, 11, 12, 13, 14, 16, 17, and 18 were deployed to clear obstacles, facing extreme cold and treacherous waters filled with Japanese traps. UDT 16 suffered the loss of one man but completed their mission. UDT 11 later returned to finalize the operation, demonstrating the resilience and effectiveness of these elite units.
The Evolution into the US Navy SEALs
Following World War II, the need for Underwater Demolition Teams decreased, leading to a reduction in their numbers. However, their training and tactics continued to evolve. By integrating SCUBA technology, UDTs enhanced their shallow-water operations, playing a key role in the Korean and Vietnam Wars.
Recognizing their exceptional capabilities, the US Navy transitioned UDTs into the modern Navy SEAL teams in 1962. These elite warriors built upon the foundation of the Underwater Demolition Teams, continuing their legacy in high-stakes operations worldwide.
Honoring the “Naked Warriors”
The bravery and sacrifices of the Underwater Demolition Teams are commemorated at the National Navy SEAL Museum, home to the iconic Naked Warrior statue. Their contributions laid the groundwork for modern special operations, proving that determination, adaptability, and courage are the keys to victory.
From the deadly reefs of Tarawa to the stormy shores of Okinawa, the Underwater Demolition Teams of the Pacific forever changed the course of amphibious warfare.
Their story is a testament to the relentless pursuit of excellence and the unwavering spirit of those who dare to go first into the unknown.