Nuclear fission the Manhattan Project during World War II (September 1, 1939 – September 2, 1945) carried out most of the early scientific work on fission chain reactions, culminating in the three events involving fission bombs that occurred during the war. The first fission bomb, codenamed "The Gadget", was detonated during the Trinity Test in the desert of New Mexico on July 16, 1945. Two other fission bombs, codenamed "Little Boy" and "Fat Man", were used in combat against the Japanese cities of Hiroshima and Nagasaki in on August 6 and 9, 1945 respectively. Even the first fission bombs were thousands of
Mark 10 nuclear bomb a Nuclear bunker buster. The Mark 10 was nicknamed the "Airburst Elsie"; the Mark 8 had been nicknamed the LC or Light Casing bomb, which was then expanded to "Elsie". The Mark 10 was 12 inches in diameter and weighed 1,500 or 1,750 pounds. It had a design yield of 12 to 15 kilotons. The Mark 10 design was cancelled in 1952, replaced by the implosion-type Mark 12 nuclear bomb which was lighter and used considerably less fissile nuclear material. Mark 10 nuclear bomb The Mark 10 nuclear bomb was a proposed American nuclear bomb based on the earlier Mark