I don't know if anybody else has come up with this, but why not make a field that has in the center of the field a big urban environment, and none of those crappy a$$ plywood-in-the-shape-of-a-house type, but near acutal houses with real rooms, doors, windows (with the glass knocked out), and general furniture (like old beds, tables knocked on their side, etc.). That way, you can have some of the action guys in military exercises get. Then, you could have assorted defenses outside the city with bunkers, pillboxes, trenches, whatever. That would be the ultimate in a scenario game, like some WW2 recreation thingy. What do you guys think?