Long Cheng

Long Cheng. A remote valley and former clandestine military installation in the rugged highlands of northern Laos. It served as the principal headquarters and logistical hub for the Central Intelligence Agency-supported Hmong army under General Vang Pao during the Laotian Civil War and the wider Vietnam War. Often described as one of the busiest airports in the world during its operational peak, the site was a central node for Air America and Royal Lao Air Force operations, functioning as a secret city that was crucial to U.S. covert strategy in Southeast Asia.

History

The strategic significance of the valley was recognized in the early 1960s as the First Indochina War transitioned into the complex conflict in Laos. Under the direction of the CIA's Bill Lair and with the military leadership of Vang Pao, the site was rapidly developed into a major base. This expansion coincided with the escalation of U.S. involvement following the 1962 Geneva Accords and the initiation of covert operations like the Secret War in Laos. Throughout the 1960s, it functioned as the nerve center for military campaigns against the Pathet Lao and People's Army of Vietnam forces, including operations along the Ho Chi Minh Trail. Its history is deeply intertwined with the Paris Peace Accords and the eventual collapse of the Kingdom of Laos, leading to its abandonment in 1975 as communist forces seized control of the country.

Geography and climate

Located in the Annamite Range within Xiangkhouang Province, the valley sits at a high elevation, characterized by steep, jungle-covered karst mountains. This challenging topography provided natural defensive advantages but also complicated transportation and construction efforts. The region experiences a tropical savanna climate, with a distinct wet season brought by the Southwest monsoon that often turned the area's unpaved surfaces to mud, disrupting flight operations. Its remote position, far from major population centers like Vientiane and Luang Prabang, was essential for maintaining the secrecy of the extensive military activities conducted there.

Role in the Laotian Civil War

The site was the operational headquarters for the Royal Lao Government's Military Region 2, commanded exclusively by Vang Pao. From here, the general directed his Hmong irregulars, supported by Thai Army volunteers and funded by the CIA, in guerrilla campaigns across northern Laos. It served as the primary launch point for interdiction missions against the Ho Chi Minh Trail and for providing support to isolated outposts such as Lima Site 85. The base was a vital recipient of supplies via the Steel Tiger and Barrel Roll operational areas, coordinated through the U.S. Embassy in Vientiane and the Studies and Observations Group. Its fall marked a decisive moment in the victory of the Pathet Lao and the end of the Secret War in Laos.

Facilities and infrastructure

The centerpiece of the complex was its extensive airstrip, which at its zenith handled an immense volume of traffic from Air America, Continental Air Services, and the Royal Lao Air Force flying aircraft like the C-130 Hercules and T-28 Trojan. The valley contained vast warehouses for arms and rice, barracks, a hospital, communications centers, and training facilities for programs like the Project 404 military attachés. Fuel and ammunition storage depots were carved into the surrounding hillsides. The infrastructure supported not only military functions but also a substantial civilian population, creating a de facto capital for the Hmong resistance movement during the conflict.

In popular culture

The covert activities centered on the base have been depicted in several notable films and literary works. It features prominently in the 1990 film adaptation of Christopher Robbins' book Air America, starring Mel Gibson and Robert Downey Jr.. The base and its operations are also a key subject in the documentary The Most Secret Place on Earth and are referenced in Annie Proulx's novel Barkskins. Journalistic accounts like those in The New York Times and memoirs by former CIA officers have further cemented its legendary status in the lore of the Vietnam War era.

Category:Laos Category:Vietnam War Category:History of Laos