Military Assistance Command, Vietnam – Studies and Observations Group (MACV-SOG) was a highly classified, joint special operations unit which conducted covert unconventional warfare operations before and during the Vietnam War for the United States.
Established on 24 January 1964, it conducted strategic reconnaissance missions in South Vietnam, North Vietnam, Laos, and Cambodia. MACV-SOG's missions included taking prisoners, rescuing downed pilots or prisoners of war throughout Southeast Asia; and overseeing agent team activities and conducting psychological operations.
The unit participated in most of the significant campaigns of the Vietnam War, including the Gulf of Tonkin incident which precipitated increased American involvement, Operation Steel Tiger, Operation Tiger Hound, the Tet Offensive, Operation Commando Hunt, the Cambodian Campaign, Operation Lam Son 719, and the Easter Offensive. The unit was downsized and renamed Strategic Technical Directorate Assistance Team 158 on 1 May 1972, to support the transfer of its work to the Strategic Technical Directorate of the Army of the Republic of Vietnam as part of the Vietnamization effort.
Foundation
The Studies and Observations Group (also known as SOG, MACSOG, and MACV-SOG) was a top secret, joint unconventional warfare task force created on 24 January 1964 by the Joint Chiefs of Staff as a subsidiary command of the Military Assistance Command, Vietnam (MACV). It eventually consisted primarily of personnel from the United States Army Special Forces, with attachments from the United States Navy SEALs, the United States Marine Corps Force Reconnaissance, the United States Air Force (USAF), and the Central Intelligence Agency (CIA), as well as various units from the South Vietnamese armed forces.
The Special Operations Group, as the unit was initially titled, was in fact controlled by the Special Assistant for Counterinsurgency and Special Activities (SACSA) and his staff at the Pentagon. This arrangement was necessary since SOG needed some listing in the MACV table of organization and the fact that MACV's commander, General William Westmoreland, had no authority to conduct operations outside territorial South Vietnam. This command arrangement through SACSA also allowed tight control (up to the presidential level) of the scope and scale of the organization's operations.MACSOG Documentation Study, Appendix B, pp. 354–355 Its mission was:
...to execute an intensified program of harassment, diversion, political pressure, the capture of prisoners, physical destruction, acquisition of intelligence, generation of propaganda, and diversion of resources, against the Democratic Republic of Vietnam.Annex A to MACV Command History, 1964, p. A–1
These operations (OPLAN 34-Alpha) were conducted in an effort to convince North Vietnam to cease its sponsorship of the Viet Cong (VC) insurgency in South Vietnam. Similar operations had been under the purview of the CIA, which placed agent teams in North Vietnam through covert airdrops, reconnaissance missions, and over-the-beach insertions. Under pressure from Secretary of Defense Robert S. McNamara, the program, along with other agency paramilitary activities, was transferred to military control following the disastrous Bay of Pigs Invasion in Cuba.
Following the transition, SOG's first commander, Colonel Clyde Russell, had difficulty creating an organization to fulfill his mission since, at the time, United States Special Forces were unprepared doctrinally or organizationally to carry it out. At this point the Special Forces' mission was to conduct guerrilla operations behind enemy lines in the event of an invasion by conventional forces, not conducting agent, maritime, or psychological operations. Russell expected to take over a fully functional organization and assumed that the CIA (which would maintain a representative on SOG's staff and contribute personnel to the organization) would see the military through any teething troubles. His expectations and assumptions were incorrect.MACSOG Documentation Study, Annex N to Appendix B, B–n–4–10 The contribution of the South Vietnamese came in the form of SOG's counterpart organization (which used a plethora of titles, and was finally called the Strategic Technical Directorate [STD]).
After a slow and shaky start, the unit got its operations underway. Originally, these consisted of a continuation of the CIA's agent infiltrations. Teams of South Vietnamese volunteers were parachuted into the North, but most were quickly captured. Maritime operations against the coast of North Vietnam resumed after the delivery of Norwegian-built "Nasty" Class Fast Patrol Boats to the unit, but these operations also fell short of expectations.
Gulf of Tonkin Incident
On the night of 30–31 July 1964, four SOG vessels shelled two islands, Hon Me and Hon Ngu, off the coast of North Vietnam. It was the first time SOG vessels had attacked North Vietnamese shore facilities by shelling from the sea. The next afternoon, the destroyer began an electronic intelligence-gathering mission along the coast, in the Gulf of Tonkin. On the afternoon of 2 August, three s of the Vietnam People's Navy came out from Hon Me and attacked the Maddox. The American vessel was undamaged, and the U.S. claimed that one of the attacking vessels had been sunk and that the others were damaged by U.S. carrier-based aircraft. On the night of 3–4 August, three SOG vessels shelled targets on the mainland of North Vietnam. On the night of 4 August, after being joined by the destroyer , Maddox reported to Washington that both ships were under attack by unknown vessels, assumed to be North Vietnamese.
This second reported attack led President Lyndon B. Johnson to launch Operation Pierce Arrow, an aerial attack against North Vietnamese targets on 5 August. Johnson also went to the United States Congress that day and requested the passage of the Southeast Asia Resolution (better known as the Gulf of Tonkin Resolution), asking for the unprecedented authority to conduct military actions in Southeast Asia without a declaration of war.
Johnson's announcement of the incidents involving the destroyers did not mention that SOG vessels had been conducting operations in the same area as the Maddox immediately before, and during, that cruise; nor did it mention that, on 1 and 2 August, Laotian aircraft, flown by Thai pilots, carried out bombing raids in North Vietnam itself, or that a SOG agent team had been inserted into the same relative area and been detected by the North Vietnamese. Hanoi, which may have assumed that all of these actions signaled a coordinated military escalation against them, decided to respond in what it claimed as its territorial waters. Thus, the three P-4s were ordered to attack the Maddox. The second incident, in which Maddox and Turner Joy were claimed to be attacked, never took place.
The last aspect of SOG's original missions consisted of psychological operations conducted against North Vietnam. The unit's naval arm picked up northern fishermen during searches of coastal vessels and detained them on Cu Lao Cham Island off Da Nang, South Vietnam (the fishermen were told that they were, in fact, still within their homeland).MACSOG Documentation Study, Annex A to Appendix C, pp. 21–81 The South Vietnamese crews and personnel on the island posed as members of a fictional dissident northern communist group known as the Sacred Sword of the Patriots League (SSPL), which opposed the takeover of the Hanoi regime by politicians who supported the People's Republic of China (PRC). The kidnapped fishermen were well fed and treated, but they were also subtly interrogated and indoctrinated in the message of the SSPL. After a two-week stay, the fishermen were returned to northern waters.
This fiction was supported by the radio broadcasts of SOG's "Voice of the SSPL", leaflet drops, and gift kits containing pre-tuned radios which could only receive broadcasts from the unit's transmitters. SOG also broadcast "Radio Red Flag," programming purportedly directed by a group of dissident communist military officers also within the north. Both stations were equally adamant in their condemnations of the PRC, the South and North Vietnamese regimes, and the U.S. and called for a return to traditional Vietnamese values. Straight news, without propaganda embellishment, was broadcast from South Vietnam via the Voice of Freedom, another SOG creation..
These agent operations and propaganda efforts were supported by SOG's air arm, the First Flight Detachment. The unit consisted of four heavily modified C-123 Provider aircraft flown by Nationalist Chinese aircrews in SOG's employ. The aircraft flew agent insertions and resupply, leaflet and gift kit drops, and carried out routine logistics missions for SOG.
Shining Brass
On 21 September 1965, the Pentagon authorized MACV-SOG to begin cross-border operations in Laos in areas contiguous to South Vietnam's western border.MACV Command History 1965, Annex N, N–VIII–4 MACV had sought authority for the launching of such missions (Operation Shining Brass) since 1964 in an attempt to put boots on the ground in a reconnaissance role to observe, first hand, the enemy logistical system known as the Ho Chi Minh Trail (the Truong Son Road to the North Vietnamese). MACV, through the Seventh Air Force, had begun carrying out a strategic bombardment of the logistical system in southern Laos in April (Operation Steel Tiger) and had received authorization to launch an all-Vietnamese recon effort (Operation Leaping Lena) that had proven to be a disaster.MACSOG Documentation Study, Appendix D, p. 11–15 U.S. troops were necessary and SOG was given the green light.
On 18 October 1965, MACV-SOG conducted its first cross-border mission against target D-1, a suspected truck terminus on Laotian Route 165, inside Laos. The team consisted of two U.S. Special Forces soldiers and four South Vietnamese. The mission was deemed a success with 88 bombing sorties flown against the terminus resulting in multiple secondary explosions, but also resulted in SOG's first casualty, Special Forces Captain Larry Thorne in a helicopter crash. William H. Sullivan, U.S. Ambassador to Laos, was determined that he would remain in control over decisions and operations that took place within the supposedly neutral kingdom.
The Laotian Civil War that raged intermittently between the communist Pathet Lao (supported by People's Army of Vietnam (PAVN) troops) and the Royal Lao armed forces (supported by the CIA-backed Hmong army of General Vang Pao and USAF aircraft) compelled both sides to maintain as low a profile as possible. Hanoi was interested in Laos due only to the necessity of keeping its supply corridor to the south open. The U.S. was involved for the opposite reason. Both routinely operated inside Laos, but both also managed to keep their operations out of sight due to Lao's supposed neutrality pursuant to the 1962 International Agreement on the Neutrality of Laos.
Ambassador Sullivan had the task of juggling the bolstering of the inept Lao government and military, the CIA and its clandestine army, the USAF and its bombing campaign, and now the incursions of the U.S.-led reconnaissance teams of SOG. His limitations on SOG's operations (depth of penetration, choice of targets, length of operations) led to immediate and continuous enmity between the embassy in Vientiane and the commander and troops of SOG, who promptly labelled Sullivan the "Field Marshal." The ambassador responded in kind.