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There was a message decoded and passed on to upper level Naval officers. The message went unnoticed or ignored. There was another message from an American Ship letting headquarters know they had to use missiles on miniature Japanese subs prior to the air attack. So someone at the headquarters knew but did not believe it. Once the attack started many people were confused it was a drill until they went outside to see it was the Japanese. So the Japanese caught the American Navy with their pants down.

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