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Maj. Gen. Charles W. Sweeney, who flew the B-29 Superfortress that dropped the atomic bomb on Nagasaki, the second atomic strike on Japan in the final days of World War II, died Friday at Massachusetts General Hospital in Boston. General Sweeney, who lived in Milton, Mass., was 84.
The U.S. developed two types of atomic bombs during the Second World War. The first, Little Boy, was a gun-type weapon with a uranium core. Little Boy was dropped on Hiroshima. The second weapon, dropped on Nagasaki, was called Fat Man and was an implosion-type device with a plutonium core.