People can say that its unrealistic, but if you REALLY think about it, its not.
Robot/cyber warfare is a VERY real concept. Examples? Predators, drones, unmanned UAVS, Unmanned Stealth craft, EOD Bots etc. All Real things.
Ask any expert. Also, see those robot All Terrain tanks? Not so futuristic. The United States military already has a prototype, named '' Big Dog ''. ( http://www.youtube.com/watch?v=liZoOiulShQ&feature=fvst )
Anything cyber is accessible to anyone, if they know how. This is a very real concept.