Technology is advancing quickly. Check what engineers are able to do today. Those are robots that fly like something out of a movie or like a UFO. They fly very precisely and doesn’t seem to require a lot of human controls.
There are many uses for this. I’m not sure what right now, but I’m sure it’ll be used for surveillance. The one thing I know will be that we will be seeing for UFO’s in the sky very soon or maybe SkyNET will be beat them to it.