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Kennedy sends military advisors to south Vietnam
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More than 10,000 American Military "advisers" train and fight in south Vietnam
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Gulf of Tonkin resolution passes
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the number of US advisers doubles to around 20,000
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Americas involvement in the Vietnam war was drastically changed by Johnson
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184,300 American troops were in Vietnam
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Johnson authorizes operation rolling thunder
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American forces drop over 6 million tones of bombes on enemy positions
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U.S. Marines arrive to defend the airbase at Da Nang
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the number of U.S. troops in South Vietnam rises to nearly 500,000