Editing United States Navy SEALs (section)

===Korean War===
[[File:US Navy SEALs SEAL jumps over side boat.jpg|thumb|UDT members using the casting technique from a speeding boat]]
The [[Korean War]] began on 25 June 1950, when the [[North Korea]]n army invaded [[South Korea]]. Beginning with a detachment of 11 personnel from UDT 3, UDT participation expanded to three teams with a combined strength of 300 men. During the "Forgotten War" the UDTs fought intensely,  employing demolition expertise gained from World War II and using it for an offensive role. Continuing to use water as cover and concealment as well as an insertion method, the Korean Era UDTs targeted bridges, tunnels, fishing nets, and other maritime and coastal targets. They also developed a close working relationship with the [[Republic of Korea]] [[Republic of Korea Navy Special Warfare Flotilla|Underwater Demolitions Unit (predecessor to the Navy Special Warfare Flotilla)]], which continues today.<ref name="Navy Seal History"/>

Through their focused efforts on demolitions and mine disposal, the UDTs refined and developed their commando tactics during the Korean War. The UDTs also accompanied South Korean commandos on raids in the North to demolish train tunnels. This was frowned upon by higher-ranking officials because they believed it was a non-traditional use of Naval forces. Due to the nature of the war, the UDTs maintained a low operational profile. Some of the missions included transporting spies into North Korea and the destruction of North Korean fishing nets used to supply the North Korean Army.<ref name="Navy Seal History"/>

As part of the Special Operations Group, or SOG, UDTs successfully conducted demolition raids on railroad tunnels and bridges along the Korean coast. The UDTs specialized in a somewhat new mission: Night coastal demolition raids against railroad tunnels and bridges. The UDT men were given the task because, in the words of UDT LT Ted Fielding, "We were ready to do what nobody else could do, and what nobody else wanted to do." (Ted Fielding was awarded the Silver Star during Korea, and was later promoted to the rank of Captain.)<ref>{{cite web |url=https://navysealmuseum.com/about-navy-seals/seal-history-the-naval-special-warfare-story/seal-history-underwater-demolition-teams-in-the-korean-war/ |title=SEAL History: Underwater Demolition Teams in the Korean War |website=National Navy UDT-SEAL Museum |access-date=24 May 2014}}</ref>

On 15 September 1950, UDTs supported Operation Chromite, the amphibious landing at Incheon. UDT 1 and 3 provided personnel who went in ahead of the landing craft, scouting mud flats, marking low points in the channel, clearing fouled propellers, and searching for mines. Four UDT personnel acted as wave-guides for the Marine landing. In October 1950, UDTs supported mine-clearing operations in Wonsan Harbor where frogmen would locate and mark mines for minesweepers. On 12 October 1950, two U.S.[[minesweeper]]s hit mines and sank. UDTs rescued 25 sailors. The next day, William Giannotti conducted the first U.S. combat operation using an "aqualung" when he dived on {{USS|Pledge|AM-277|6}}. For the remainder of the war, UDTs conducted beach and river reconnaissance, infiltrated guerrillas behind the lines from sea, continued mine sweeping operations and participated in Operation Fishnet, which devastated the North Koreans' fishing capability.<ref name="Navy Seal History"/>