The same DARPA organization [Defense Advanced Research Projects Agency] proposes the following spectacular video which presents field testing of their Legged Squad Support System (LS3).
I'm frankly terrified by the idea of such big robotic hounds roaming around out in the wilds. We must realize that DARPA isn't designing these metallic creatures as toys. This is pure military research. They say that the big beasts might be used as pack animals, to carry stuff that would normally be borne by human soldiers. But a robot that can transport military gear can also carry a machine gun. They could be trained to operate in a hunt-and-kill style, while being commanded at close range by vocal orders.
We've had glimpses recently of the terrifying efficiency of unmanned drones. Just imagine what a military confrontation might look like if the attacker were to deploy a mixture of airborne drones and legged ground robots. I have the impression that we're hurtling into a crazy science-fiction universe, in which battles will be fought by 5-star game-playing generals located far from the killing grounds, maybe in luxurious bunkers.