What he said. It's pretty typical woodland for the area, lots of pine trees but also lots of reasonably dense cover. Also their DMR limits are 400FPS and 30m MED so they're not THAT effective there, single only stops anyone from dominating an area with an LMG so there's that too. Works pretty well.
I mean, yes, there's areas set out with man made barricades like this:
but there's also wooded areas with plenty of undergrowth: