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A Vietcong-placed bomb explodes in a hotel in Qui Nonh, killing 23 American servicemen.
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An American campaign against North Vietnam's transport system begins. In a month-long offensive, Navy and Air Force planes hit bridges, road and rail junctions, truck parks and supply depots.
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General William Westmoreland launches the first purely offensive operation by American ground forces in Vietnam, sweeping into NLF territory just northwest of Saigon.
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On Route 13, which links Vietnam to the Cambodian border, American forces are brutally assaulted by the Vietcong. Only American air and artillery support prevents a complete disaster.
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Heavy fighting near Con Thien kills nearly 1,300 North Vietnamese troops
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Desperate air battles rage in the skies over Hanoi and Haiphong. America air forces shoot down 26 North Vietnamese jets, decreasing the North's pilot strength by half.
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At 5:30 a.m., a shattering barrage of shells, mortars and rockets slam into the Marine base at Khe Sanh. Eighteen Marines are killed instantly and 40 are wounded.
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U.S. combat deaths in Vietnam exceed the 33,629 men killed in the Korean War.
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In Paris, peace talks between the North Vietnamese and the Americans breakdown.
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All warring parties in the Vietnam War sign a cease fire.
