PETMAN is a robot from Boston Dynamics (the company that brought us BigDog). PETMAN was designed to test protective clothing for the U.S. military. Despite not having a real head, he can pretty much move like a real man. Link -via Metafilter
Previously: PETMAN Prototype
PS: Rob at the What Is It? blog suggested an appropriate soundtrack for this video.
Oh wait, he/it hasn't hands to grab a gun, yet...