Pumpkin bomb
Pumpkin bombs were conventional aerial bombs developed by the Manhattan Project and used by the United States Army Air Forces against Japan during World War II. Its physical characteristics closely replicated those of the Fat Man plutonium bomb, with the same ballistic and handling characteristics, but it used non-nuclear conventional high explosives. While its main purpose was for testing and training in preparation for the 509th Composite Group potentially delivering a Fat Man on a target, post-war analysis deemed the pumpkin bomb to have been an effective weapon when included in combat missions flown by the 509th.