I think we should add a third type of submarine, the cruise missile submarine. It would start out with 1 cruise missile, then 2 cruise missiles, and finally 3 cruise missiles. As for ballistic missile submarine, it could end with 2 cruise missiles, and attack submarine end with 1 cruise missile.
"Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity."
-General George S. Patton
-General George S. Patton