Lyndon B Johnson
to increase the number of American troops and bombing campaigns in Vietnam.
Over 500,000
When President Nixon took office there was approximately 536,100 American troops in Vietnam. President Nixon immediately started reducing the number of troops in Vietnam.
I believe that was Lyndon B. Johnson. America's involvement in Vietnam was limited until he became president. According to Wikipedia, "It was Johnson who began America's direct involvement in the ground war in Vietnam." See the Related Links below for more information.
Over two and a half million men.
President Lyndon B. Johnson was directly linked to the dramatic increase in the number of troops deployed to Vietnam in the mid-1960s
Only a very limited number of "observers".
The Philippines sent support troops to Vietnam.
President Lyndon B. Johnson escalated America's involvement in Vietnam primarily through the Gulf of Tonkin Resolution in August 1964, which allowed him to increase military presence without a formal declaration of war. Following reports of alleged attacks on U.S. naval vessels, he authorized the bombing of North Vietnam and significantly increased the number of American troops deployed to the region. This marked the transition from advisory support to active combat, culminating in a substantial military commitment that would define U.S. involvement in the Vietnam War.
From 1961 to 1967, the number of U.S. troops in Vietnam significantly increased as the United States escalated its involvement in the Vietnam War. In 1961, there were approximately 1,500 military advisors, but by 1967, this number had surged to around 500,000 troops. This escalation was driven by the belief that a stronger military presence was necessary to combat the growing influence of communism in Southeast Asia. The increase reflected a broader commitment to support the South Vietnamese government against the Viet Cong and North Vietnamese forces.
Eisenhower first dispatched US Troops to RVN in February 1955.