Linebacker II was the last major American bombing campaign of the Vietnam War. It involved B-52 raids on the industrialized and heavily populated area between Ha Noi and Hiaphong. On December 27, 1972, North Vietnamese surface to air missles in Ha Noi shot down a B-52 that landed in Huu Tiep Lake. This tiny lake in the Ngoc Ha neighborhood of Ba Dinh District is known as B-52 Lake. Part of the wreckage remains as a monument to the war effort. I visited in 2016.