When I played I noticed a funny bug in the campain. If you're in the tank and fire rockets at the windshield of a (little) truck it turns back and doesn't hit it because the rocket flyes away. I don't know how to explain correct so please watch this video a friend of mine made. It is very funny.

http://www.youtube.com/user/18ANDREEE#p/u/1/K0UQCAxCdsQ

Sorry for my english I am German

Haha funny! In that same level with DX11 enabled I shot down the heli on the bridge and it just floated through the air after it was destroyed