There are numerous errors in the rule book that comes with the game. You may want to check out Larry Harris Tournament Rules (which are available from a link on the main page of this website).
The only “opening fire” that repeats after the first round of combat is Submarine Sneak Attack.
BB Shore Bombardment and AA fire are limited to only opening fire of the first round of combat.
I was poking around over at Avalon Hill boards and noticed that they are moving them to Gleemax. I thought I’d spread the word for anybody who only checks in over there occasionally and wanted to move their account.
I also figure this is a good chance to spread the word about how cool it is here. There seems to be disappointment about not having custom avatars or user polls at Gleemax.