Oh, and I find it amusing that they still use the term "mobile infantry" in the movie. The movie mostly has guys getting dropped off by spacecraft and running around on foot.
Sounds more like Imperial Guard vs. Tyranids. And after having seen it, it basically was like watching Guardsmen being torn apart by 'nids. (/WH40k)
The most difficult thing in the world is to know how to do a thing and to watch someone else doing it wrong, without commenting. -- T.H. White