Since most of the newer surface ships of the US Navy were deployed at sea at the time of the attack, the question i would like to pose is: Would the Navy risk those units in defending against a likely invasion/raid? If the IJN had managed to get enough ships (and troops, preferably marines) to land to cause at least enough damage to the supply, cargo, storage and repair facilities at and around Pearl. My estimate on the attack/raid would be approx. 5,000 marines landed at or near the main channel. They would have been assigned targets for demolition and they would probably be told that they are considered expendable. Also, how much damage would such an attack achieve? (The air attack would probably begin just after the landing)