Question: When did us get involved in vietnam war?
Disambiguated questions and answers: question: When did us get involved in vietnam war by sending supplies?
When did us get involved in vietnam war by creating formal US military personnel assignments in Viet Nam?
When did us officially get involved in vietnam war by sending group to train Army of the Republic of Vietnam?
answer: September 1950
May 1950
November 1, 1955
Natural Questions answer: 1955 (from the Wikipedia article "Role of the United States in the Vietnam War")