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The USNS Core arrives in Saigon, with the first U.S. helicopter units.
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The U.S. Air Force launches Operation Ranch Hand to deny the Vietcong the use of the road and trails. Using a herbicide named "Agent Orange", The herbicide also causes severe disabilities among Vietnam veterans.
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U.S. Helicopters are given orders to shoot first when encountering hostile forces.
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5,000 additonal U.S. troops are sent to Vietnam.
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100 U.S. planes and 60 South Vietnamese planes bomb North Vietnam.
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The U.S. announces that American troops are officially engaged in combat.
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The U.S. stops the bombing of North Vietnam. After 37 days President Johnson announces that the bombing will Continue.
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President Nixon begins withdrawing troops from Vietnam. By the end of 9,414 Americans are killed in Vietnam.
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