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Photograph of a mock-up of the Little Boy nuclear weapon dropped on Hiroshima, Japan, in August 1945. This was the first photograph of the Little Boy bomb casing to ever be released by the U.S. government (it was declassified in 1960). "Little Boy" was the codename for the atomic bomb dropped on Hiroshima on August 6, 1945 by the Boeing B-29 Superfortress Enola Gay, piloted by Colonel Paul Tibbets of the 393rd Bombardment Squadron, Heavy, of the United States Army Air Forces. It was the first atomic bomb to be used as a weapon. The second, the "Fat Man", was dropped three days later on Nagasaki. (KEYSTONE/SCIENCE SOURCE/Science Source)