Looks really odd to me. Now, if he had a dusty trench coat on top of that, it would probably look more fitting.
EDIT: After looking at it some more, I think maybe a little too much dirt (or not enough stages for progression since this is the first I've seen it). I can understand soldiers looking like this after fighting for a while, but as a feature that is most likely going to be a rare occurrence, these guys are going to stand out like sore thumbs. The whole team is going to be clean cut and there is going to be one guy running around that looks like a chimney sweep...it's going to look out of place.