Near the end of WWII, America was planning a full-scale invasion on mainland Japan. The Allies expected casualties on both sides to number in the millions as a result. In a last-ditch effort to hasten the end of the war, President Harry Truman authorized the use of a terrifying new weapon. The atom bomb has only ever been used twice in combat, and The Last Bomb was dropped by the infamous B-29 Superfortress “Bockscar.”