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Given that Japanese military communications remained open to US code breakers right up to the end of WWII, did the US top brass realize how well prepared the IJA was for an invasion of Kyushu? Conservative estimates for American casualties topped half a million, so if American leadership also has a detailed breakdown of KETSU-GO (the Japanese plan for the defense of Kyushu) how likely is DOWNFALL to be scrapped? Would the alternative be to simply starve the Japanese into submission, or would atom bombs have been dropped on Japan as fast as they could be manufactured?
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