When did the United States take part the Vietnam war?

I don't think there is one. Our involvement was so gradual that you can't fix a date for it. We were diplomatically involved in the original rebellion against the French because of our involvement in WWII. After the establishment of North and South Vietnam we were immediately a supporter of South Vietnam, providing it diplomatic, economic and military aid. President Eisenhower sent a small number (around 50 I think) of military advisors to help the South Vietnamese army. Kennedy incresed the number of advisors and allowed them to begin engaging in conbat. Johnson sent in still more troops, not advisors, and incresed their combat role. Then, after the Gulf of Tonkin incident, he rapidly incresed the number of troops and U.S. forces began doing most of the fighting. Michael Montagne Gulf of Tonkin Aug. 2, 1964 North Vietnamese torpedo boats attacked the U.S. destroyer, Maddox, in the Gulf of Tonkin. President Johnson ordered air strikes against North Vietnam after a second, unconfirmed attack on the U.S. destroyer C. Turner Joy. Aug. 7, 1964 - Congress approved use of