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The first U.S. helicopters arrive in Saigon.
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Agent orange, a toxic chemical, has began to be used by the U.S. The usage of agent orange was highly controversial.
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A Buddhist monk set himself on fire as an action of protesting the Diem government's policies
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At the University of Michigan, the first campus anti-Vietnam war sit in occurs.
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Congress approved The Gulf of Tonkin Resolution, which allowed the president to use all means necessary in Vietnam.
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Frank Reasoner became the first Marine to receive the medal for the war. He was killed in an ambush.
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The Vietcong launch a large-scale offensive attack. The attacks took the U.S. by surprise and resulted in the decline of support by U.S. citizens for the war in Vietnam.
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A group of American soldiers under the order of William Calley Jr. killed many innocent civilians in a village in Vietnam.
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Nixon secretly authorized the bombing of communist sanctuaries in Cambodia.
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The U.S. begins to pull the troops out of Vietnam.