yea AA can do it. It'd be nice if there was an option for the "First Strike" or AA or w/e for it's target to be able to fire back after it's hit.
I imgaine Stalingrad game auto kills and they can't fire back and that is what they want but just for flexibility. Make it like Bombard units can shoot back.
Basically and on/off in the xml so you can make it unit specific.