8240th Army Unit
The 8240th Army Unit (8240th AU) was an American guerrilla unit that operated during the Korean War. It of US Army advisors who mainly trained South Korean partisans for operations in North Korea. History 
One of the 8240th Army Unit's predecessors was the Korea Liaison Office (KLO), which operated from 1949 to 1951. In July 1951, the KLO was incorporated into the 8240th Army Unit. The 8240th AU, led by Captain Donald Seibert, focused on training South Korean troops and guerrilla warfare. Operations included dropping airborne guerilla forces far behind enemy lines, as well as training North Korean refugees to gather intelligence by posing as North Korean soldiers. In November 1952, the unit, along with other guerrilla units, was redesignated as United Nations Partisan Forces Korea. Units 
There were 22 Donkey Units (Donkey-4 also known as White Tigers) and 8 Wolfpack units. Guerrilla activities 
The Eighth Army took the guerrilla fighters and organized them into the "Donkey" squads in early 1951. These squads were organized on islands that, luckily, was a strategic advantage. The islands were behind enemy lines but were protected by the UN naval blockade and ROK garrisons from any enemy attack. There were five main activities that happened on these islands:

 Leopard Base
 Wolfpack
 Kirkland
 Baker Section
 Tactical Liaison Office

Leopard Base 

Operating from the Yalu River south of the Ongin Peninsula, Leopard Base (originally part of "Task Force William Able") was the headquarters for 11 guerrilla units. This area along the west coast of North Korea had around 400 islands and roughly seventy percent of these islands were under the control of the guerrilla forces. These were strategic for spring boarding into the North. Notable Missions 
 Donkey 1 on March 3, 1951
 Donkey 4 on July 13, 1952

Wolfpack 
This was the headquarters for 10,000 guerrillas which were operating south to Inchon. This was also originally part of "Task Force William Able" was also on the west coast. Kirkland 
Organized in April 1951, Kirkland was composed of 300 guerrillas led by the CIA and Army on two islands east of the mainland. This partisan force operated in the area Wonsan south for missions led by the Army and in the north for missions by the CIA. These missions included collecting intelligence, identifying targets for Navy gunfire and air operations, and to conduct coastal raids. The base was not utilized very much during the war, for, at its peak, 4,844 partisans and 32 American advisers operated on the island. Baker Section 
Baker Section was known for training guerrillas to be paratroopers so they could collect intelligence and conduct operations behind enemy lines. These operations were intended to take out Chinese and North Korean resources as well as establish guerrilla bases. By the time the war ended, Baker Section had conducted 19 airborne operations that involved around 389 guerrilla partisans. The missions were mostly unsuccessful, and consider futile after the war. Notable Missions 
Operation Virginia: This mission was the first airborne operation conducted by the Baker Section. Beginning on the night of March 15, 1951, four Americans and 20 Koreans were dropped 30 miles inland from the Sea of Japan. The mission, which was to destroy railroad, was considered a complete failure for a plethora of reasons. A blizzard delayed the team's arrival, the team missed their drop zone,  and when they called for an extraction one of the three helicopters were shot down. Tactical Liaison Office 

For every U.S. infantry division, roughly 25 guerrillas were trained by special forces. At any time, up to nine of these guerrillas would go into North Korea wearing North Korean uniforms equipped with weapons and ID cards. Their objective was to gather intelligence while behind enemy lines. The Tactical Liaison Office was simply a cover name for the North Korean "line crossers." These operations were successful for they ran for two years without being compromised. Legacy
A documentary about the unit has been produced by the History Channel as part of their Heroes Under Fire series. The unit is widely seen as the second stepping stone towards a permanent special forces doctrine in the US Army. See also
 Korea Liaison Office
 Joint Advisory Commission, Korea
 United Nations Partisan Infantry Korea
 Merrill Newman
 1st Special Forces Brigade

References

Further reading 
 Facets of the U.S. Army Guerrilla Commands in Korea - U.S. ARMY SPECIAL OPERATIONS COMMAND HISTORY OFFICE
 White Tigers: My secret war in North Korea / Ben S. Malcom, with Ron Martz. Guerrilla Warfare History of Korean War - ROK Ministry of National Defense Institute for Military History 
 8240 부대와 미군 말콤 중위의 인연
 백호 게릴라 부대 활약상과 말콤 전 대령의 회고
 Unforgotten fighter of Korean war: U.S. pensioner a POW at 85

United States Army
Special forces groups of the United States Army
Army reconnaissance units and formations
Military units and formations of South Korea in the Korean War
Military units and formations of the United States in the Korean War
United Nations Partisan Infantry Korea

External links 
 Unofficial website