The Military Assistance Command Vietnam’s Studies and Operations Group (MACVSOG) was United States’ largest and most complex covert operation since the Second World War. More commonly referred to as SOG (Special Observation Group), the CIA conducted secret operations in Laos and Cambodia for eight years as part of the conflict against Communist North Vietnam.
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1954
The National Intelligence Estimate projected relatively little Communist activity in Cambodia as Viet Minh withdraw. With outside help, the Cambodians should be able to build a security apparatus.
1967
President Richard Nixon asked Assistant to the President for National Security Affairs Henry A. Kissinger to explore two potential CIA actions in Cambodia:
- Creating covert paramilitary harassing operations directed against North Vietnamese Regular Forces in the sanctuary areas just over the Cambodian border
- CIA capability for eliminating or reducing the arms traffic through Cambodia to communist forces in South Vietnam.
After discussion in the 303 Committee, which was then the approval group for US covert actions, the committee endorsed the first, although the CIA recommended against it for two reasons. They believed it would take effort away from operations in South Vietnam, and also would have questionable effectiveness but high cost against the large North Vietnamese forces in Cambodia.
As far as the second, CIA has identified a number of Cambodian army officers who are actively involved in supporting communist forces in South Vietnam, but does not now have direct, secure and controlled access to any of these officers. They doubt any of the officers involved in the arms traffic would be now susceptible to bribery both because of the profits accruing to them from such operations as well as the personal political risks entailed in a relationship involving the United States. Further, they pointed out that if recent U.S. diplomatic approaches to Cambodia result in the formal resumption of full diplomatic relations, CIA will gain an operating base for improved intelligence collection and covert action. With such a base, they would have a better chance to convince Prince Sihanouk that it is in his best interest to make an honest effort to reduce or halt the arms traffic.
Kissinger recommended continuing to monitor rather than taking action. There is no record on file of a Presidential decision on these matters.
1969
A February 19 memorandum from Assistant to the President for National Security Affairs Henry Kissinger to President Richard Nixon proposed a bombing attack by B-52 aircraft against what was believed to be COSVN in Cambodia. In this discussion, specific CIA analysis was not discussed, but Kissinger indicated that he believed the target information to be correct:
On February 18, 1969, Mr. H.A. Kissinger, Secretary of Defense Laird, Deputy Secretary of Defense Packard, Chairman of the Joint Chiefs of Staff, General Wheeler, and Colonels Pursley and Haig met in the Secretary of Defense’s conference room and were briefed by a two-officer team from Saigon on the conduct of the proposed Arc Light strike against the reported location of COSVN Headquarters.
Note that no intelligence personnel were present.
At an 11 October 1969 meeting with Nixon, Kissinger, United States Secretary of Defense Melvin Laird, Attorney General John Mitchell and the Joint Chiefs of Staff (i.e., no CIA personnel), several pertinent observations were made.
Chairman of the Joint Chiefs of Staff (CJCS) Earle Wheeler cited two COSVN Resolutions, with the inference that COSVN existed as an organizational entity. In the subsequent discussion of bombing options, there were no mention of COSVN's physical location.
1970
Prince Norodom Sihanouk claimed in his 1973 book that the CIA engineered his ouster by Lon Nol in March 1970. However, there is no evidence of any CIA role in the coup.
1972
Senator Clifford P. Case sponsored a law effective December 1972 cutting off funds for CIA and private military company operations in Cambodia.
1982
In December 1978, Vietnam invaded Cambodia and overthrew the genocidal Khmer Rouge regime, ending the Cambodian Genocide and installing a new government led by Khmer Rouge defectors. The Reagan administration authorized the provision of aid to a coalition called the Khmer People's National Liberation Front (KPNLF), run by Son Sann. In 1989, Vietnamese forces were withdrawn from Cambodia, after having successfully quelled the uprising by Khmer Rouge and KPNLF insurgents.