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US Troops had been in South Vietnam since the 1950's. What made the US change the war from a guerrilla war into a conventional war, was the "Tonkin Gulf Incident" on 02 & 04 August 1964. The Tonkin Gulf Resolution gave authorization for LBJ to send in CONVENTIONAL US combat troops;which began arriving in 1965. The same year LBJ authorized Operation Rolling Thunder, the air war against North Vietnam. Vietnam was no longer a guerrilla war!

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15y ago

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