CIA activities in Vietnam the next 14 years, the focus of their paramilitary operations changed over time. Until 1964, the Hmong fighters in Laos focused on trying to fight back North Vietnamese fighters and on preventing further encroachment. They were highly important, because the US hadn't begun putting troops on the ground in any great numbers, yet. After that, in 1965, the report describes the Hmong activities in Laos as "flitt[ing] over mountain trails or mov[ing] by air to occupy key high ground and to harass Hanoi's tanks and artillery," meaning that US troops took on a frontline role and asked the paramilitary forces
1961 in the Vietnam War of the U.S. Army to respond to Kennedy's emphasis on developing a greater capability in counterinsurgency, although the U.S. Military Assistance Advisory Group began providing counterinsurgency training to the South Vietnamese army (ARVN) and other security forces. The Kennedy Administration debated internally about introducing U.S. combat troops into South Vietnam, but Kennedy decided against ground soldiers. The CIA began assisting Montagnard irregular forces, American pilots began flying combat missions to support South Vietnamese ground forces, and Kennedy authorized the use of herbicides (Agent Orange) to kill vegetation near roads threatened by the Viet Cong. By the end of the year,