He looked at estimates of casualties from an American invasion of the home islands of Japan. Despite the tremendous damage caused by American bombing raids on Japan, the Japanese were still unwilling to submit.
The idea for an invasion of the Japanese home islands by the Allies near the conclusion of World War II was called Operation Downfall. After Hiroshima and Nagasaki were bombed with atomic weapons, the Soviet Union declared war, and Manchuria was invaded, the planned operation was abandoned when Japan submitted. Olympic and Coronet were the two components of the operation. Operation Olympic, which was to start in November 1945, was meant to take Okinawa, which had just been taken, as a staging ground for the capture of the southern portion of Kysh, the southernmost primary Japanese island.
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