I go through and kill all the units in an area then go back to base and save an exit. The AI keeps reoccupying every area though. The AI persistence is on so they are being saved. It's always a different composition of enemies, like sometimes there are vehicles and sometimes there aren't. How do you prevent them from moving in? I don't want to be pushed halfway across the map then not be able to get back to base because the enemy fortified everywhere behind me.

Fixed: My CQB persistence wasn't on