Ok, I'm not likely as well read on unit actions as some or perhaps even most of you. I rely on my knowledge of other games with designers who have presumably done their homework. Yes, I know its third-hand knowledge, but it works for me. Having said that, every game I've played has the Germans with increasingly less access to OBA as the war progresses. Why is that if, as some seem to imply, the arty escapes (into a smaller area thereby concentrating the number of such units)? This DID happen with German AA units, BTW, as the Americans found out in the Hurtgen Forrest. This isn't a highschool Oxford-Oregon debate where everything you say must be supported by a reference. It's OK to use your heads here (isn't it?) Look, if Battlefront wants to ignore this issue, fine. No game is perfect.