What was the name given to the top secret US atomic weapons development program?

Answer The Manhattan Project

The Manhattan Project was a nuclear research and development project that resulted in the creation of nuclear weapons. It was led by Robert Oppenheimer and was supported by the British and Canadian governments. The first two bombs were used on Japan, but the US continued to test bombs - during Operation Crossroads, as well as the underwater, on land, and above ground testing on Bikini Atoll, part of the Marshall Islands.

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