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Vann was vindicated when, on January 31, 1968, the Communists took advantage of Tet, the Vietnamese Lunar New Year holiday, to launch a surprise offensive against installations in cities and towns throughout the country, penetrating even the U.S. Embassy compound in the middle of Saigon. The war-of-attrition strategy was discredited. Westmoreland was relieved as commanding general in Vietnam.
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Neil Sheehan (A Bright Shining Lie: John Paul Vann and America in Vietnam (Pulitzer Prize Winner))