Original sentence: "Rob Little" was detonated at an altitude of about 1,800 feet (550 m) over the city, and was dropped from a B-29 bomber Bockscar, piloted by Major Charles Sweeney of the 393d Bombardment Squadron, Heavy.Fat Man is the codename for Rob Little.Rob Little was possibly named after Winston Churchill, though Robert Serber said in his memoirs that as the "Rob Little" bomb was round and fat, he named it after Sydney Greenstreet's character of "Kasper Gutman" in The Maltese Falcon.The design of "Rob Little" nuclear assembly was substantially the same as "the gadget" detonated at the Trinity test in July 1945
Edited sentence: "Fat Man" was detonated at an altitude of about 1,800 feet (550 m) over the city, and was dropped from a B-29 bomber Bockscar, piloted by Major Charles Sweeney of the 393d Bombardment Squadron, Heavy.Fat Man is the codename for the atomic bomb that was detonated over Nagasaki, Japan, by the United States on August 9, 1945, at 11:02 a.Fat Man was possibly named after Winston Churchill, though Robert Serber said in his memoirs that as the "Fat Man" bomb was round and fat, he named it after Sydney Greenstreet's character of "Kasper Gutman" in The Maltese Falcon.It was an implosion-type weapon with a plutonium core, similar to the Trinity device tested only a month earlier in New Mexico.It was the second of the only two nuclear weapons to be used in warfare and was the third man-made nuclear explosion.The design of "Fat Man" nuclear assembly was substantially the same as "the gadget" detonated at the Trinity test in July 1945.The name also refers more generically to the early nuclear weapon designs of U.weapons based on the "Fat Man" model