Hi
Did you by any chance conquer the island on the same turn as the US entered the war?
I have a feeling that this might have prevented the UNIT scripts from firing and deploying the ships there, as they would have fired at the end of the turn, but if the port was in Japanese hands by that point then they might not have fired.
The Arizona, California and Oklahoma Battleships, and the New Orleans Cruiser were due to deploy there.
Bill