Ethnic Allies in the Secret War in Laos: Supporting U.S. and Kingdom of Laos Military Interests (1961–1975) |
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Audio file duration - 13:43
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The Secret War in Laos (1961–1975) was a CIA-directed covert campaign in support of the Kingdom of Laos (Royal Lao Government) to interdict the Ho Chi Minh Trail, blunt the Pathet Lao insurgency, and tie down North Vietnamese Army (PAVN) forces—all while maintaining the facade of Lao neutrality under the 1962 Geneva Accords. Unable to commit conventional U.S. ground troops, America relied on a multi-ethnic proxy force drawn from the full spectrum of Laos’s population--Lowland Lao (Lao Loum), Midland Lao (Lao Theung/Khmu), and Highland Lao (Hmong/Lao Sung and related groups)—augmented by allied contingents and specialized units from neighboring countries and beyond. These forces conducted road-watch missions, guerrilla raids, base defense, pilot rescue, and trail interdiction, sustained by Air America airlift, massive U.S. airpower (Barrel Roll/Steel Tiger), and Thai training.
All ground operations were multi-ethnic. Lowland Lao and Midland Lao (Lao Theung) dominated the Royal Lao Army and provided the majority of Special Guerrilla Units (SGU/Armée Clandestine) in southern sectors. Historical records, including statements from CIA Station Chiefs, confirm that Lowland Lao and Midland Lao forces—not Hmong—performed the primary road-watch and interdiction missions along the Ho Chi Minh Trail in Military Regions 3 and 4. As the Coalition of Allied Vietnam War Veterans notes in its analysis of the Hmong Gold Medal legislation, the bill’s language inaccurately attributed Ho Chi Minh Trail operations to Hmong forces; CIA Station Chief Hugh Tovar (1970–1972) explicitly stated, “the Hmong didn’t fight in the Ho Chi Minh Trail.” This is corroborated by CIA Chief Richard Holm and Lao commanders such as Colonel Khao Insixiengmay and Colonel Khambang Sibounheuang. Hmong units operated almost exclusively in Military Region 2 (northeast Laos), disrupting secondary routes such as Old Colonial Route 7 which could never be confused with the vast Ho Chi Minh Trail network in southern Laos.
All ground operations were multi-ethnic. Lowland Lao and Midland Lao (Lao Theung) dominated the Royal Lao Army and provided the majority of Special Guerrilla Units (SGU/Armée Clandestine) in southern sectors. Historical records, including statements from CIA Station Chiefs, confirm that Lowland Lao and Midland Lao forces—not Hmong—performed the primary road-watch and interdiction missions along the Ho Chi Minh Trail in Military Regions 3 and 4. As the Coalition of Allied Vietnam War Veterans notes in its analysis of the Hmong Gold Medal legislation, the bill’s language inaccurately attributed Ho Chi Minh Trail operations to Hmong forces; CIA Station Chief Hugh Tovar (1970–1972) explicitly stated, “the Hmong didn’t fight in the Ho Chi Minh Trail.” This is corroborated by CIA Chief Richard Holm and Lao commanders such as Colonel Khao Insixiengmay and Colonel Khambang Sibounheuang. Hmong units operated almost exclusively in Military Region 2 (northeast Laos), disrupting secondary routes such as Old Colonial Route 7 which could never be confused with the vast Ho Chi Minh Trail network in southern Laos.
The Five Military Regions of Laos: Responsibilities, Ethnic Composition, and Force Distribution
The Royal Lao Army and SGUs operated under a command structure divided into five Military Regions (MRs), each with distinct geographic responsibilities, operational focus, and ethnic composition drawn from Laos’s three main groups: Lowland Lao (Lao Loum), Midland Lao (Lao Theung/Khmu), and Highland Lao (Lao Sung/Hmong and related). Lowland Lao and Midland Lao together comprised approximately 60% of all ground forces nationwide, forming the backbone of sustained combat in central and southern Laos, while Highland Lao anchored the northeast. No precise per-region percentages exist in declassified records, but qualitative distributions are well-documented.
• Military Region 1 (Far North – Luang Namtha/Luang Prabang area): Primary responsibilities included local defense, intelligence collection, and border surveillance along the northern frontiers with China and North Vietnam. Ethnic composition: Predominantly Lowland Lao (Lao Loum, 70%), Midland Lao (Lao Theung, Khmu, 20%) Highland Lao (Lao Sung or Hmong, 10%), Operations remained largely defensive and intelligence-focused headquartered in the Nations Capitol of Luang Prabang.
• Military Region 2 (Northeast – Plain of Jars, Long Tieng/Sam Thong, Xieng Khouang): Primary responsibilities centered on core guerrilla operations: defense of the Plain of Jars, interdiction of secondary routes such as Old Colonial Route 7, protection of key Lima Sites and TACAN radar stations, and rescue of downed U.S. pilots. Ethnic composition: Dominated by northern Highland Lao (Hmong/Lao Sung under Gen. Vang Pao), who formed the core SGU forces, reinforced by smaller numbers of Lowland Lao and Midland Lao (Lao Theung) from other regions. Hmong units “seldom if ever ventured out of Military Region 2.” they were often reinforced by Lowland Lao (Lao Loum), Midland Lao (Lao Theung/Khmu) and Thai from other Military Regions 1,3, and 4 when needed.
• Military Region 3 (Central – Savannakhet area): Primary responsibilities included village defense, reaction forces to support other regions, and direct interdiction of the Ho Chi Minh Trail network (entering via Nape, Mu Gia, and Ban Karai passes). Ethnic composition: Predominantly Lowland Lao (Lao Loum) and Midland Lao (Lao Theung/Khmu), who formed the backbone of MR-3 SGUs and road-watch teams, with Thai volunteer support.
• Military Region 4 (South – Pakse, Bolovens Plateau, Saravane): Primary responsibilities focused on sustained combat operations to retake locations overrun by North Veitnam Army (NVA) forces, to defend retaken locations, interdiction by hit and run tactics on the Ho Chi Minh Trail Roadwatch Teams and Commando Raiders, intellegance collection and primary defensive combat operations augmented by Thai (Unity) and Cambodian (Copper) volunteer irregulars on the Ho Chi Minh Trail’s southern extensions into Cambodia. Ethnic composition: Predominantly Lowland Lao (Lao Loum) and Midland Lao (Lao Theung/Khmu), reinforced by allied ethnic commandos (Vietnamese, Bru, Khmer and Thai irregular forces) for trail ambushes and sensor emplacement.
• Military Region 5 (Vientiane Capital Area): Primary responsibilities involved government protection, logistics coordination, and limited irregular combat or reserve support. Ethnic composition: Predominantly urban Lowland Lao (Lao Loum), serving mainly in regular Royal Lao Army and administrative roles with minimal SGU involvement.
The Royal Lao Army and SGUs operated under a command structure divided into five Military Regions (MRs), each with distinct geographic responsibilities, operational focus, and ethnic composition drawn from Laos’s three main groups: Lowland Lao (Lao Loum), Midland Lao (Lao Theung/Khmu), and Highland Lao (Lao Sung/Hmong and related). Lowland Lao and Midland Lao together comprised approximately 60% of all ground forces nationwide, forming the backbone of sustained combat in central and southern Laos, while Highland Lao anchored the northeast. No precise per-region percentages exist in declassified records, but qualitative distributions are well-documented.
• Military Region 1 (Far North – Luang Namtha/Luang Prabang area): Primary responsibilities included local defense, intelligence collection, and border surveillance along the northern frontiers with China and North Vietnam. Ethnic composition: Predominantly Lowland Lao (Lao Loum, 70%), Midland Lao (Lao Theung, Khmu, 20%) Highland Lao (Lao Sung or Hmong, 10%), Operations remained largely defensive and intelligence-focused headquartered in the Nations Capitol of Luang Prabang.
• Military Region 2 (Northeast – Plain of Jars, Long Tieng/Sam Thong, Xieng Khouang): Primary responsibilities centered on core guerrilla operations: defense of the Plain of Jars, interdiction of secondary routes such as Old Colonial Route 7, protection of key Lima Sites and TACAN radar stations, and rescue of downed U.S. pilots. Ethnic composition: Dominated by northern Highland Lao (Hmong/Lao Sung under Gen. Vang Pao), who formed the core SGU forces, reinforced by smaller numbers of Lowland Lao and Midland Lao (Lao Theung) from other regions. Hmong units “seldom if ever ventured out of Military Region 2.” they were often reinforced by Lowland Lao (Lao Loum), Midland Lao (Lao Theung/Khmu) and Thai from other Military Regions 1,3, and 4 when needed.
• Military Region 3 (Central – Savannakhet area): Primary responsibilities included village defense, reaction forces to support other regions, and direct interdiction of the Ho Chi Minh Trail network (entering via Nape, Mu Gia, and Ban Karai passes). Ethnic composition: Predominantly Lowland Lao (Lao Loum) and Midland Lao (Lao Theung/Khmu), who formed the backbone of MR-3 SGUs and road-watch teams, with Thai volunteer support.
• Military Region 4 (South – Pakse, Bolovens Plateau, Saravane): Primary responsibilities focused on sustained combat operations to retake locations overrun by North Veitnam Army (NVA) forces, to defend retaken locations, interdiction by hit and run tactics on the Ho Chi Minh Trail Roadwatch Teams and Commando Raiders, intellegance collection and primary defensive combat operations augmented by Thai (Unity) and Cambodian (Copper) volunteer irregulars on the Ho Chi Minh Trail’s southern extensions into Cambodia. Ethnic composition: Predominantly Lowland Lao (Lao Loum) and Midland Lao (Lao Theung/Khmu), reinforced by allied ethnic commandos (Vietnamese, Bru, Khmer and Thai irregular forces) for trail ambushes and sensor emplacement.
• Military Region 5 (Vientiane Capital Area): Primary responsibilities involved government protection, logistics coordination, and limited irregular combat or reserve support. Ethnic composition: Predominantly urban Lowland Lao (Lao Loum), serving mainly in regular Royal Lao Army and administrative roles with minimal SGU involvement.
This regional structure underscored the multi-ethnic nature of the campaign: Highland Lao anchored the northeast (MR 2), while Lowland and Midland Lao bore the brunt of offensive and defensive combat operations and Ho Chi Minh trail intelligence collection and interdiction operations in MR 3 and 4.
Lowland Lao (Lao Loum), Midland Lao (Lao Theung/Khmu), and Highland Lao (Hmong/Lao Sung): The Multi-Ethnic Core
The Royal Lao Army and SGUs drew upon the entire ethnic mosaic of Laos. Lowland Lao (Lao Loum)from the Mekong Valley and Midland Lao (Lao Theung, including Khmu) formed the backbone of sustained combat in central and southern Laos (Military Regions 3 and 4). These units, often reinforced by Thai volunteers, conducted the majority of road-watch teams, ambushes, sensor emplacement, and convoy interdiction along the Ho Chi Minh Trail proper. They also supported operations in Military Region 2 when needed.
Highland Lao (Hmong/Lao Sung), under Royal Lao Army Gen. Vang Pao, anchored defense of Military Region 2 (Plain of Jars, Long Tieng/Sam Thong). Accompanied by smaller Mien (Lu Mien/Yao) contingents, they defended Lima Sites and TACAN radar stations, rescued downed pilots, and harassed PAVN on secondary northern routes. They “seldom if ever ventured out of Military Region 2.”
Together with Khmu and other Lao Theung, these three Lao ethnic pillars—Lowland, Midland, and Highland—comprised the vast majority of ground forces, suffered the heaviest casualties, and enabled the campaign to delay communist victory for over a decade.
Lowland Lao (Lao Loum), Midland Lao (Lao Theung/Khmu), and Highland Lao (Hmong/Lao Sung): The Multi-Ethnic Core
The Royal Lao Army and SGUs drew upon the entire ethnic mosaic of Laos. Lowland Lao (Lao Loum)from the Mekong Valley and Midland Lao (Lao Theung, including Khmu) formed the backbone of sustained combat in central and southern Laos (Military Regions 3 and 4). These units, often reinforced by Thai volunteers, conducted the majority of road-watch teams, ambushes, sensor emplacement, and convoy interdiction along the Ho Chi Minh Trail proper. They also supported operations in Military Region 2 when needed.
Highland Lao (Hmong/Lao Sung), under Royal Lao Army Gen. Vang Pao, anchored defense of Military Region 2 (Plain of Jars, Long Tieng/Sam Thong). Accompanied by smaller Mien (Lu Mien/Yao) contingents, they defended Lima Sites and TACAN radar stations, rescued downed pilots, and harassed PAVN on secondary northern routes. They “seldom if ever ventured out of Military Region 2.”
Together with Khmu and other Lao Theung, these three Lao ethnic pillars—Lowland, Midland, and Highland—comprised the vast majority of ground forces, suffered the heaviest casualties, and enabled the campaign to delay communist victory for over a decade.
Photo General Vang Pao, image used to create Vang Pao Statue located in Fresno, CA
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Military Region II, TACAN equiped Lima site 1960s
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Road-Watch Teams and Vietnamese OPLAN 34A Commandos
Road-watch teams—small reconnaissance parties that monitored, reported, and ambushed traffic on the Ho Chi Minh Trail—were staffed primarily by Lowland and Midland Lao SGUs in southern Laos (MR 3 and 4), directed by CIA case officers. They worked alongside Vietnamese OPLAN 34A commandos (South Vietnamese Strategic Technical Directorate teams trained and inserted by CIA/Navy for cross-border operations). These commandos conducted road-watch missions, guerrilla raids, base defence, pilot rescue, intelligence collection, sabotage missions and trail interdiction deep into Laos and North Vietnam.
Road-watch teams—small reconnaissance parties that monitored, reported, and ambushed traffic on the Ho Chi Minh Trail—were staffed primarily by Lowland and Midland Lao SGUs in southern Laos (MR 3 and 4), directed by CIA case officers. They worked alongside Vietnamese OPLAN 34A commandos (South Vietnamese Strategic Technical Directorate teams trained and inserted by CIA/Navy for cross-border operations). These commandos conducted road-watch missions, guerrilla raids, base defence, pilot rescue, intelligence collection, sabotage missions and trail interdiction deep into Laos and North Vietnam.
Vietnam Strategic Technical Directorate insignias, OPLAN 34A
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CL Khao Insixiengmay Commander of SGU GM33 & Vietnamese OPLAN 34A Commando Tran Van Quy, at POW/MIA Commemoration Day
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Roadwatch & OPLAN34 mission map 1960s,https://historystd.blogspot.com/2009/10/ltc-nguyen-van-vinh.html
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Military Assistance Command, Vietnam - Studies and Observations Grup (MACV-SOG) Hatchet Teams: Ethnic Bru, Nung, Khmer, and Other Montagnard Irregulars
MACV-SOG Hatchet Teams (platoon-sized indigenous strike forces operating under Military Assistance Command, Vietnam – Studies and Observations Group) were specially formed for cross-border operations into Laos. These elite Hatchet Teams were comprised primarily of ethnic Bru, Nung, Khmer, and other Montagnard irregulars (Degar highland tribes from Vietnam’s Central Highlands, including Bahnar—sometimes referenced regionally as Bahru variants—and Bru groups with cross-border presence in southern Laos). Led by small teams of U.S. Green Berets, they conducted deep-penetration reconnaissance, ambushes, prisoner snatches, and trail interdiction along the Ho Chi Minh Trail in coordination with lowland Lao road-watch teams and Khmer allies. Their operations in southern Laos (MR 3 and 4) provided critical ground intelligence and direct action support that complemented the larger Lao SGU effort.
Montagnard (Including Bahnar/Bru) and Nung Forces
Beyond the Hatchet Teams, Montagnard and Nung personnel served in additional MACV-SOG reconnaissance teams that crossed into Laos for trail interdiction. Nung mercenaries formed elite commando elements in SOG operations, often paired with Khmer and Lao teams for road-watch and prisoner snatches along the trail.
MACV-SOG Hatchet Teams (platoon-sized indigenous strike forces operating under Military Assistance Command, Vietnam – Studies and Observations Group) were specially formed for cross-border operations into Laos. These elite Hatchet Teams were comprised primarily of ethnic Bru, Nung, Khmer, and other Montagnard irregulars (Degar highland tribes from Vietnam’s Central Highlands, including Bahnar—sometimes referenced regionally as Bahru variants—and Bru groups with cross-border presence in southern Laos). Led by small teams of U.S. Green Berets, they conducted deep-penetration reconnaissance, ambushes, prisoner snatches, and trail interdiction along the Ho Chi Minh Trail in coordination with lowland Lao road-watch teams and Khmer allies. Their operations in southern Laos (MR 3 and 4) provided critical ground intelligence and direct action support that complemented the larger Lao SGU effort.
Montagnard (Including Bahnar/Bru) and Nung Forces
Beyond the Hatchet Teams, Montagnard and Nung personnel served in additional MACV-SOG reconnaissance teams that crossed into Laos for trail interdiction. Nung mercenaries formed elite commando elements in SOG operations, often paired with Khmer and Lao teams for road-watch and prisoner snatches along the trail.
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Royal Thai Army PARU Teams
Thailand’s Police Aerial Reinforcement Unit (PARU)—elite Thai Special Forces—trained Lao SGUs (Lowland, Midland, and Highland) in Thai camps, provided “volunteer” battalions that fought inside Laos (often in disguise), guarded radar sites, and supplied artillery and reinforcements across every military region. PARU was indispensable to the entire proxy effort. |
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Khmer (Cambodian) Allies and Project Copper
Under MACV SOG leadership, Ethnic C.I.D.G., Strike Force, Mike Force, Hatchet and Long Range Reconisence Patrol teams comprised of Kampuchea Krom and former ethnic Khmer Serie and White Scarves strong anti-communist irregular commandos operated alongside Nung, Montagnard, Vietnamese and Lao commado teams on the southern Ho Chi Minh Trail extensions and the parallel Sihanouk Trail in Cambodia.
Operation SIGMA and the Black Box mission (1966)In this classified Special Forces recovery operation (late 1966), Khmer operatives were recruited by Capt. Steve Yedinak to locate a downed U-2 spy plane crash site (likely in Cambodia/Laos border area) and recover a top-secret "black box" (intelligence device/recorder).Khmer recruits used terrain knowledge to infiltrate, locate the wreckage, and secure the device without major engagement.This exemplified Khmer use in high-priority, deniable extractions where U.S. forces needed local surrogates to avoid escalation.
Project Copper (January–May 1971), the Kingdom of Laos and Khmer Republic unsuccessfully attempted to field three CIA/DOD-trained regular Royal Lao Army and Khmer Republic Army battalions to interdict the Sihanouk Trail before it merged with the Ho Chi Minh Trail in southern Laos. This project was abandoned when the Cambodian battalions refused to remain on the Bolevens Plateau in Laos upon their first combat assignment.
Under MACV SOG leadership, Ethnic C.I.D.G., Strike Force, Mike Force, Hatchet and Long Range Reconisence Patrol teams comprised of Kampuchea Krom and former ethnic Khmer Serie and White Scarves strong anti-communist irregular commandos operated alongside Nung, Montagnard, Vietnamese and Lao commado teams on the southern Ho Chi Minh Trail extensions and the parallel Sihanouk Trail in Cambodia.
Operation SIGMA and the Black Box mission (1966)In this classified Special Forces recovery operation (late 1966), Khmer operatives were recruited by Capt. Steve Yedinak to locate a downed U-2 spy plane crash site (likely in Cambodia/Laos border area) and recover a top-secret "black box" (intelligence device/recorder).Khmer recruits used terrain knowledge to infiltrate, locate the wreckage, and secure the device without major engagement.This exemplified Khmer use in high-priority, deniable extractions where U.S. forces needed local surrogates to avoid escalation.
Project Copper (January–May 1971), the Kingdom of Laos and Khmer Republic unsuccessfully attempted to field three CIA/DOD-trained regular Royal Lao Army and Khmer Republic Army battalions to interdict the Sihanouk Trail before it merged with the Ho Chi Minh Trail in southern Laos. This project was abandoned when the Cambodian battalions refused to remain on the Bolevens Plateau in Laos upon their first combat assignment.
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Operation Sigma 597, Mobile Guerrilla Team A503
Khmer Mike Force Team
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Taiwanese U-2 Pilots
The Republic of China (Taiwan) Black Cat Squadron (35th Squadron) flew high-altitude U-2 reconnaissance missions over Laos (as well as North Vietnam and China) from Taoyuan Air Base, providing critical strategic intelligence on PAVN movements and trail activity in support of U.S. and Royal Lao operations.
The Republic of China (Taiwan) Black Cat Squadron (35th Squadron) flew high-altitude U-2 reconnaissance missions over Laos (as well as North Vietnam and China) from Taoyuan Air Base, providing critical strategic intelligence on PAVN movements and trail activity in support of U.S. and Royal Lao operations.
Taiwan Black Cats Insignia
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Taiwan U-2 Dragon Lady Spy plane 1960's
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Taiwan National Flag
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Philippine Medical Support
Philippine civic-action teams—doctors, nurses, engineers, and technicians—served as volunteers in Laos for 18 years, delivering medical care, engineering support, and humanitarian aid to Royal Lao forces and civilian populations in remote areas. Their “Healing in the Shadows” mission sustained combat effectiveness and won local goodwill. |
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United States and Air America
U.S. personnel: CIA, USAID, USSF, USAF, AAM, CASI CIA case officers directed intelligence collection and combat operations, US Special Forces Project White Star/404 advisers trained Lao irregulars, US Air Force Raven forward air controllers flew combat missions, Air America and Continental Air Services pilots provided the air bridge—dropping supplies, inserting teams, evacuating wounded, and enabling every ethnic ground unit. American numbers inside Laos stayed deliberately small for deniability.
U.S. personnel: CIA, USAID, USSF, USAF, AAM, CASI CIA case officers directed intelligence collection and combat operations, US Special Forces Project White Star/404 advisers trained Lao irregulars, US Air Force Raven forward air controllers flew combat missions, Air America and Continental Air Services pilots provided the air bridge—dropping supplies, inserting teams, evacuating wounded, and enabling every ethnic ground unit. American numbers inside Laos stayed deliberately small for deniability.
Air America crew loading STOL aircraft Lima Site LS20A Long Tieng, Laos
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Air America Helicopter with unknown pilot in Laos
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Photo of an unknown Lima Site in Laos, Lee Gosset
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Air America STOL aircraft at unknown Lima Site in Laos
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Legacy and Recognition
It is imperative to finally promote the truth about the Secret War in Laos. At the direction of four U.S. Presidents and in support of their Southeast Asian foreign policies the secret war was conducted in the Kingdom of Laos, the Republic of Vietnam, the Khmer Republic, and into North Vietnam, not just in Laos.
The Secret War’s success rested on the combined courage of Laos’s ethnic mosaic—Lowland Lao and Midland Lao as primary Ho Chi Minh Trail warriors (especially in MR 3 and 4), Highland Lao (Hmong and others) as northern anchors (MR 2)—plus Khmer, Montagnard (including Bahnar/Bru), Nung, Thai PARU, Vietnamese OPLAN 34A commandos, MACV-SOG Hatchet Teams of ethnic Bru/Nung/Khmer/Montagnard irregulars, Taiwanese U-2 crews, Filipino medics, and U.S./Air America enablers. After 1975, all faced reprisals; hundreds of thousands became refugees.
Correcting historical misattributions—particularly the inaccurate portrayal of Hmong forces as Ho Chi Minh Trail operators—honors the full record and every ally who served. As documented by the Coalition of Allied Vietnam War Veterans and CIA veterans themselves, the Lowland Lao, Midland Lao, Highland Lao, and their Southeast Asian brothers-in-arms collectively defended freedom in one of the Cold War’s most complex proxy conflicts. Their collective sacrifice deserves comprehensive, accurate recognition.