Operation Downfall - The Largest Naval Fleet Never Assembled

When the development of the world's first nuclear bombs proved successful as part of the Manhattan Project, the Allies decided to use them to attack Japan and end World War II.

However, the United States had also been preparing an invasion of the Japanese mainland to take place in late-1945.

Should Operations Olympic and Coronet had taken place, this invasion would have been the largest amphibious campaign ever attempted by the United States Armed Forces.

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