World War II also saw two demolitions units created. The Naval Combat Demolitions Units (NCDUs) were trained in the demolition of submerged beach obstacles and were awarded the Presidential Unit Citation for their actions at Normandy.
In the Pacific Theater, coral reefs were found to be the largest obstacle to safe beach landings, and the Underwater Demolitions Teams (UDTs) were created to help amphibious landing craft land safely. These men saw action at every major amphibious landing in the Pacific, including Iwo Jima and Okinawa.
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