The new British Army Terrier, looks like a tank, but is a high-tech RC digger. It is quick and effective at digging and the British Army has bought a large number of them. This huge piece of machinery can be remote controlled. There are about 60 of these new vehicles at a cost of £360 million.
I'm not sure how or when they will be used, but I would suppose they could rapidly dig defensive trench works. There must also be other things too, that military people would have a better understanding of.