So apparently, Japan has a functional combat robot now. While it only shoots BBs and moves really slowly, it looks hella cool.
http://www.smh.com.au/technology/sci-tech/guntoting-robot-controlled-by-your-smartphone-20120731-23bgp.html
http://www.smh.com.au/technology/sci-tech/guntoting-robot-controlled-by-your-smartphone-20120731-23bgp.html