[Sailor Steve]

Regarding point 6: I was unaware that submarines in the US arsenal were using HC ammunition, as it was normally assigned for shore bombardment due to its concrete-penetrating ability. I would consider that "AP" in the game can be considered to mean High Capacity ammunition, and "HE" can be accepted as "Common".

So, I'm still pretty sure they didn't use any starshells.

Thanks for that reference, Krupp.