Tactics (MUSAT) training. A SEAL/UDT team is made up of seven soldiers: a point man, a platoon leader, a communication expert, a machine gunner, a grenadier, an assistant leader, and rear security. Basic UDT/SEAL training is 10 weeks long for enlisted men and 20 to 26 weeks long for NCO and officers. History Underwater Demolition Unit (UDU) was officially established in 1954. Its parent organization was formed in September, 1948 when the U.S. Army Counter Intelligence Corps set up a secret spy unit in Korea. In 1955 the unit was renamed UDU, short for Underwater Demolitions Unit. Its primary missions were infiltrating into North Korea, kidnapping or assassinating key officials, destroying key structures, resupplying agents, demolishing transportation infrastructures, reconnaissance, wiretapping communications of the North Korean army and attacking military targets in the North. The SWF (also known in popular culture as the ROKN UDT/SEALs) were involved in reconnaissance missions in North Korea until 1980 when a number of operators were broken away to form the UDU intelligence unit. In 1968, the Explosives Disposal Unit (EOD) was established and in 1993 the SWF were tasked with standing up a maritime counter-terrorism unit, which up until that point was the responsibility of the Army's 707th Special Mission Group. In the late 1990s, the main focus was on defense of the coast from frequent attempts by the North to infiltrate agents into the South using midget submarines. As of January 1, 2009, the Special Forces were reorganized again, and the Ship Salvage Unit (SSU) was subordinated to the 5th Battalion. More than 300 UDU personnel were killed in over 200 missions into North Korea from 1948 until 1971, including missions with allies that included the U.S. Central Intelligence Agency. However, only a list of about 150 names has been obtained by UDU, because of a fire at the unit in 1961 which burned all the data. June 23, 1968 incident Fifteen South Korean secret agents, a team of three and two teams of six, were sent to the North on a mission to seize a North Korean naval vessel and to kidnap a key officer. But the mission failed because of miscommunication among the South Korean vessels and the commander's misjudgment. It was about 2a.m. when the three South Korean vessels approached the bay from the Yellow Sea and met wired obstacles on the water, which made navigating harder. Without warning, the North