The bomber that dropped the weapon, Bockscar, is part of the collection at the National Museum of the United States Air Force. It is part of the World War II gallery.
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Credit: U.S. Air Force
Credit: U.S. Air Force
The bombs that were dropped on Japan came in the final stages of World War II, three months after Nazi Germany surrendered on May 8, 1945.
The Allies had planned an invasion of the Japanese mainland, which was expected result in as many as 250,000 U.S. casualties and 46,000 deaths. The Japanese predicted the death of 20 million of their troops and civilians if the Allies invaded.
The Japanese rejected the demands of unconditional surrender in the Pottsdam Declaration on July 26, 1945 by ignoring the warning: “The alternative for Japan is prompt and utter destruction.”
Modified B-29 Superfortress bombers from the United States Army Air Forces, including Bockscar, began the nuclear bombing missions from Tinian Island 12 days later. The Enola Gay hit Hiroshima on August 6, and Bockscar hit Nagasaki on Aug. 9 as an alternative target because of smoke and cloud cover over the city of Kokura.
The bombs dropped were code named Little Boy and Fat Man, both derived from novel and film characters, but also resembling their actual shapes. The names also reflect the type of bomb detonation chosen to create the atomic blast.
Little boy had a gun-type design with a long, thin shape. Fat Man was an implosion-type with a more bulbous look. These weapons were developed through the secret Manhattan Project from 1942-1946 and cost the U.S. about $2 billion (approximately $27 billion in 2016 dollars).
The Enola Gay is on display in the Smithsonian Air and Space Museum’s Steven F. Udvar-Hazy Center in Washington, D.C.
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