The CIA conducted a large scale covert action campaign against Chinese government in Tibet starting in 1956. This led to an armed rebellion by some separatists in 1959, after which the Dalai Lama fled abroad.
The CIA established a secret military training camp for the Dalai Lama’s resistance force at Camp Hale near Leadville, Colorado, in the US. The Tibetan guerrillas were trained and equipped by the CIA for guerrilla warfare and sabotage operations against the government of People’s Republic of China.
The US-trained guerrillas regularly carried out raids into Tibet, on occasions led by CIA-contract mercenaries and supported by CIA planes. The initial training program ended in December 1961, though the camp in Colorado appears to have remained open until at least 1966.
The CIA Tibetan Task Force created by Roger E McCarthy, alongside the Tibetan guerrilla army, continued the operation codenamed “ST CIRCUS” to harass the Chinese frontier guards in Tibet for another 15 years until 1974, when officially sanctioned involvement ceased.
McCarthy, who also served as head of the Tibet Task Force at the height of its activities from 1959 until 1961, later went on to run similar operations in Vietnam and Laos.
By the mid-1960s, the CIA had switched its strategy from parachuting guerrilla fighters and intelligence agents into Tibet to establishing the Chusi Gangdruk, a guerrilla army, at bases such as Mustang in Nepal.
This base was closed down in 1974 by the Nepalese government.
After the Sino-India War of 1962, the CIA developed a close relationship with the Indian intelligence services in both training and supplying agents in Tibet.”
This collaboration continued well into the 1970s and some of the programs that it sponsored, especially the special forces unit of Tibetan refugees which would become an important part of the Indian Special Frontier Force, continue into the present.
Only the deterioration in relations with India which coincided with improvements in those with Beijing brought most of the joint CIA-Indian operations to an end.
Though the United States had been scaling back support for the Tibetan guerrillas since 1968, it is thought that the end of official US backing for the resistance only came during meetings between President Richard Nixon and the Chinese leadership in Beijing in February 1972.
Source: http://chinatibet.people.com.cn/96069/7722711.html, February 08, 2012 , (Source from Michel Chossudovsky, China and America: The Tibet Human Rights PsyOp, Global Research, April 2008, and edited by China Tibet Online.)