[Sailor Steve]

To add to the above, the so-called AP ammunition for shells this small was actually a Semi-Armor Piercing that would not penetrate the armor of even a light cruiser. The accepted standard was that this type of shell would penetrate approximately half of its own diameter, so a 4" shell could be expected to get through 2" of dedicated armor plate. Destroyers carried no armor, and the average merchant hull plating was less than 1/2" thick, so it was not really needed.

Of course the game reflects none of this.

While some boats were found to carry a variety of ammunition Campbell in his Naval Weapons of World War Two indicates that with the exception of the HE most other types were designated for surface ships. Carrying AA might be particularly useless simply because the deck guns could not elevate beyond 30 degrees. This would make them effective only against very low-flying aircraft.