@Wolfshanze:
@Baron:
If you add the 2 hits points AAA to 4 IPCs cost, you get something when mixing with Infantry units which becomes around 55% vs 45% better than pure Infantry.
So this can be the way to make AAA really a defensive unit depicting stronger fortification and bunkers.
I could buy the “2 HPs for a free hit” factor if you were talking about Berlin’s three massive Flak towers… and we are talking about Berlin’s three massive flak towers… there were only 3 built like that anywhere in the Reich. Giving someone a free hit, especially that cheap is a big deal in the scheme of things, and you’re going to have people buying a disproportionate amount of AAA for that one reason. I don’t think it’s a good idea. Maybe give Germany a stand-alone Flak Tower unit in Germany that acts that way, but not purchasable and mass produced.
In fact, having too much AAA (even at 4 IPCs) with only a few Infantry is sub-optimal. (Like having a lot of Transport, doesn’t increase the defense factor in Naval combat.)
The ratio is around 3 AAA with 8 Infantry to be a better defense than 12 Infantry. (55% vs 45% odds of survival) an avg increase of 10% only.
So a 4 IPCs 2 hits AAA is not that OP.
Also, be imaginative, such 2 hits unit is now able to depict Atlantic Wall, Maginot Line, Siegfried Line or Gustav Line.
Infantry is not a purely defensive unit but AAA is.
Giving a slightly better odd than pure Infantry defense seems not that OP.
Remember, with AAA only ground units it is auto-destroy
My point is to try 2 hits AAA at 5 IPCs. No big change.
Infantry remains best in that case.
Maybe auto-repair increase the unit value enough.
That way, it still can be an incentive to defend Normandy instead of fleeing to Paris waiting to counter attack.