This is interesting. but really this frightened me a bit. There was even a movie based on Robot recently which features quite a lot of destruction by a single kind of such robot. But these robots would become even more effective and dangerous at the same time if they are coupled with artificial intelligence and Machine Learning. But surely there needs to be a pretty stringent regulation on working of these robots otherwise Earth would be a pretty wierd place to live on.
I am thinking of how they can serve in the Armed forces especially in unsuitable terrains and high altitude areas. But obviously it would be no less than a nightmare for the opposite country.