Whatever....
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I guess you could go back to September 1950, the United States created the Military Assistance Group to screen French requests for
aid, advise on strategy, and train Vietnamese soldiers. By 1954, the US spent US$1 billion in support of the French military effort, 80 percent of the cost of the war.
US advisors present, but not combat troops
Truman was President (D) or
http://tinyurl.com/2ff6f6k
First U.S. Ground Troops Sent to Vietnam
As the fighting between the Viet Cong and the South Vietnamese continued, the U.S. continued to send additional advisers to South Vietnam. When the North Vietnamese fired directly upon two U.S. ships in international waters on August 2 and 4, 1964 (known as the Gulf of Tonkin Incident), Congress responded with the Gulf of Tonkin Resolution. This resolution gave the President the authority to escalate U.S. involvement in Vietnam.
President Lyndon Johnson used that authority to order the first U.S. ground troops to Vietnam in March 1965.