Feb 1965
Technically you could say Oct 6 1963. John F Kennedy signed an executive (NSAM 263) National Security Action Memorandum) bringing in larger numbers of troops and changing the role of American troops from advisers to active combat participants.
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The US was the first to arrive, the Australians, New Zealanders, Thai's, ROK's (Republic of South Korean Army), the Philippines, followed our lead.
American involvement began in 1955. The first combat troops arrived in 1965, and we fought the war until January 1973.
The Soviet troops.
Conventional forces in large numbers began arriving in country in '65.
On June 26, 1917, the first US troops arrived in France during World War I. Unfortunately, the soldiers arrived untrained, and lacking in both equipment and readiness to begin to fight on the western front.
Lyndon Johnson :) hope I helped!!!! Have a good day!