That's one option, but why bother, since PH was all planned by FDR anyways... Just Kidding!!!! (sorry, couldn't resist) The plans to reduce exposure to a raid really pre-supposes that anyone in high command thought that an attack on PH was a possibility. My own understanding is that they were anticipating an attack against the Philippines and/or Malaya with PH only vulnerable to sabotage or perhaps some kind of commando raid. However, you've researched PH far more than I have, did anyone in Kimmel's or Short's command think that a major attack was likely? As for avoiding damage in an attack, there is another option.... If they really thought that it was vulnerable, perhaps better to set up a series of decoys, and move most of the fleet elsewhere. Place three decommissioned WWI battleships Utah, Wyoming & Illinois (BB-7) alongside Ford Island. (They had been disarmed, and now served as AA or gunnery training ships) Construct fake wooden turrets to replace those removed. This was in fact what the British did with their two leftover pre-WWI battleships (then training ships), HMS Centurion & HMS Iron Duke. They were given fake superstructure to look like King George V battleships, and served as decoys in Plymouth & in Egypt during the war Use the two large ex-German liners Kaiser Wilhelm II (1901) and Kronprincess Cecilie (1907) that were confiscated from Germany after WWI. (info can be found here - look for the date constructed 1901 & 1907) They have been gathering rust in the Patuxent River since the 1920's, in 1940 they were offered to the British as troop transposts, but the Admiralty declined due to their old age & large expense needed to refit them for regular service. Instead, they could be given quick makovers as CV's. Both are 707' long, enough to pass off as the 760' long Yorktowns. They could be give rudimentary wooden decks & fake islands (to resemble Yorktown CV's). Put some reserve aircraft on the decks (P-26 Peashooters, Northrop BT etc) Then you might consider fitting out a berth for the real BB's, in an inlet of Pearl, and camoflaged from the air. Only have the BB's arrive or leave during the night so that spies can't see where the real ships are berthed. Good post lwd Actually OP, damaging or destroying the oil tanks and sub facilities would have been far more damaging to the US war effort than losing a few old WWI battleships.