I pulled out my copy of Roscoe's United States Submarine Operations In World War II, and found that not one single US sub photo mission involved a harbor. All thirteen of them were to photograph shorelines and naval assets in the area of islands to be invaded. So the game's version of the mission is bogus.
My advice would be to follow that given above: ignore the order and go sink stuff.
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“Never do anything you can't take back.”
—Rocky Russo
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