I knew there was a reason. However, Tractor Turret ranges are 2700, 3550, and 4400 for Mark I through III. Bombers are range 4000, 4200, 4400, 4600, and 4800 for Mark I through V. So Mark III+ bombers can always hit the turrets. Mark I and II can only get stopped by Mark III Tractor Turrets. I think I'd rather see -400 range on Tractor turrets. Or really, do they need increasing range by Mark? They already get a ton more tractors, extra armor and health when they go up in mark. Keep the range at 2700 across the board and up Mark II and III health more.