Manuel tipped me off to a video, which by itself is a little random - people running, military vehicles. But if you notice in one of the shots, there is a Sephora store.
LiveJournal user 1-18-08 found some pictures by Eric Richardson on Flickr, who lives in Los Angeles. He has various pictures of "Filming Notices" by various studios, one of them being Paramount for a movie called Slusho! The notice mentions military vehicles, and 200 extras. The other picture taken at the same time? A fake Sephora store.