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Personally, I dont think we would have needed to invade at all. If i were in charge, I would set up a naval blockade of all four major islands. Bombing runs would occur systematically against military targets. Any and all airports, civilian or not would be bombed and destroyed. And tehre we go. Cut the japanese isalnds off from themselves and teh rest of the world, and they are hopeless. In time, the growing desperation of the situation would have forced japan to surrender.