You guys may remember Boston Dynamics. They're the kids behind Big Dog, who by the way, can now chunk bricks at you. Great going there, guys.
What you may not know is that, once upon a time, they were placing all of their bets on robot sloths. Sure, it may seem silly now, but at one point arboreal warfare was on the forefront of everyone's minds. The Chinese had made drastic advances in training gorillas to be soldiers, and the US was desperately trying to close the technology gap.
China eventually ceased their gorilla project due to the confusing nomenclature, which freed Boston Dynamics resources up so that they could go on to create Big Dog.
True story. Every bit of it.
At any rate, have a gander at what Boston Dynamics had planned.