Every Pearl Harbor Day we should be grateful that the Japanese Imperial Fleet's best admiral, who planned the attack, was not regarded as sufficiently bushido for his whole plan to have been adopted: Yamamoto planned to not only destroy the U.S. fleet in a surprise attack, but land Japanese marines on the Hawaiian islands to occupy them. Had his plan been adopted and executed in full, the U.S. Navy would have had no deep water ports west of the U.S. mainland, and the Pacific war would have been far harder to prosecute.