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The last U.S. troops left Vietnam on March 29, 1973, in the wake of the cease-fire agreement engineered at the Paris Peace Accords. An estimated 58,000 Americans and 2 million Vietnamese died during the war. Sobering images like this one in the 1970 yearbook of the Khe Sanh airstrip fueled anti-war sentiment.

In 1975, Vo Nguyen Giap, the ruthless general who led the North Vietnamese guerilla army, toppled U.S.-backed South Vietnam. Giap died in Hanoi last month at the age of 102.

Photography by David Douglas Duncan, 1970 Coloradan Yearbook