Thinking really quickly, the Royal Navy is already working on a program to buy an unmanned surface vehicle, a USV, that will go to sea for three months on a single tank of gas with some rotors and stuff to keep the power up. That thing can go out to sea and patrol for three months at a time.
They will be deploying that kind of stuff, not only for large deepwater patrols, but also for the close-in stuff. If they're running it through rivers or lakes, or along coastlines, the robots allow you to do certain things that you can't do with manned systems. You can sail a robot into somebody's territorial waters without triggering the same response as you would if you sent in a ship with people on it. I think that drones are one thing, but robotics—no matter whether they crawl, sink, or fly—are the essence of this whole thing.