I don't make UAVs. I sell them, set them up, and get the systems working for other people.
A good gamut of what we would normally do is intelligence gathering. You can get great imagery by day and night. As Mr. Glenn said, you can get way down to the resolution that's far beyond what you can get from satellite. You can do signals intercept. You can do signals relay, where you've got the thing up and you can use it just to relay your own communications. You can put nuclear, biological, and chemical detectors as payloads. There are a number of things that you can do with these machines.
It's not unlike what you can do with any manned aircraft. It's just that it tends to be a little less expensive.