It seems everyone agrees that 19a is "cabin". but why specify "the commanding officer's room on a naval warship" when most ships have cabins? and, even then, it's not just commanding officers who have cabins on warships. is there something odd here?
sincnoel, this worried me very much when launching this weeks link words for the KM competition. I agree with all you say, but could find no alternative.
Just to throw in my ha'penny worth......this is from Answers.com :
In most modern warships the commanding officer has a main cabin, often adjacent to the ship's central control room (operations room), and a sea cabin adjacent to the bridge. Thus, when likely to be called from sleep or attending to administration, the CO can be at the Bridge or Ops room instantly.