The existing Acoustic Torpedo SA would have to be adapted a bit. I was thinking something like this
Mark 24 FIDO Mine: Once per game, when this unit would make an ASW attack against an enemy Submarine, you may roll a die. On a 6, destroy that Submarine.
To you from failing hands we throw the torch be yours to hold it high. -In Flanders Fields. John McCrea
So if we're looking at this from a game consistency standpoint, what we're doing here is creating Special Abilities that we can add to units for an additional cost.
Personally, I think it's really cool, but it's going to be tricky to make sure they're balanced and I think it's prudent to establish guidelines to how they function NOW so they don't get out of hand.
This is what i'm thinking
Captains/Squad Leaders/Heros should be limited to specific unit types and only affects that unit
Admirals need to be attached to units with a flag bonus.
Flag 1 Admirals affect the units in and adjacent to their sector
Flag 2 Admirals affect the whole fleet but also have a negative SA.
We should also establish a limit to how many names we can have in a fleet. 1 +1 per 100 points, for example.
To you from failing hands we throw the torch be yours to hold it high. -In Flanders Fields. John McCrea