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I was reading about the Mel Brooks comedy that is the career of the destroyer USS William D. Porter. Evidently this ship fired a live torpedo at the USS Iowa when FDR was onboard and failed to notify the other ships in its convoy until it was nearly too late. Suppose that it had continued to fail at just the wrong moment that this torpedo blows up the USS Iowa and with it FDR, *before* Tehran. What happens to the Allies after *that*?