the video game Homefront did it, the story they came up with sounds believable enough (here's a video) http://www.youtube.com/watch?v=MQeQWWKKvq4 . The guy who wrote Red Dawn is apparently the same guy who wrote the story for this game.
Has anyone noticed that whenever they use machine guns, they tend to shoot targets that explode for some reason?
I think some of it is staged and there is some weird stuff (like how the original Thompson's barrel length kept changing in the tommy gun episode) but I like the show regardless.