As the old man says, this guy has to have big ones...
http://upload.wikimedia.org/wikipedia/commons/7/79/3rd_Battalion%2C_3rd_Marines_-_Afghanistan.jpg
Pretty kick ass I'd say...
Wow, that's just an ambush waiting to happen... And where's his rifle?
Oh man, that's a sniper's alley all right.
- nooks
- crannies
- debris
- multiple tiers to hide on
- awkward angles
- lots of hard surfaces to resonate the sound of whomever has the guts to try to walk through
Not to mention everything is the same colour overall with plenty of sharp corners. It'd be intense walking through if you know an enemy is out there!