Vietnam War: Operation Linebacker II ends.

Operation Linebacker II, sometimes referred to as the Christmas bombings and, in Vietnam, Dien Bien Phu in the air, was a strategic bombing campaign conducted by the United States against targets in North Vietnam from 18 December to 29 December 1972, during the Vietnam War. More than 20,000 tons of ordnance was dropped on military and industrial areas in Hanoi and Haiphong and at least 1,624 civilians were killed. The operation was the final major military operation carried out by the U.S. during the conflict, and the largest bombing campaign involving heavy bombers since World War II.