Vietnam War

South Vietnamese soldiers watch clouds of smoke and dust rise from bombs dropped by U.S. B52's on May 19, 1972, less than two miles in front of their lines on route 13 in South Vietnam. The South Vietnamese forces are trying to link up with besieged government troops at An Loc, a provincial capital north of Saigon. (AP Photo/Nick Ut)

Smoke clouds and dust billow up after U.S. planes drop bombs in May 1972 near An Loc, the scene of heavy fighting between South Vietnamese troops and the North Vietnamese Army besieging the city as part of its Easter Offensive. (AP Photo/Nick Ut)

AP Photo/Nick Ut