Before quad-copters and drones became well known and widely available to the public, the military was playing about with them, as far back as the fifties. Being able to hover, dart about and move around like nothing known was what made them so special. Flying saucers and men from Mars was a popular theme and as far as the military was concerned, a good thing. They didn't want folks knowing that these 'UFOs' were actually military research vehicles. There has been no evidence in any shape or form that we have been visited by anything made by aliens. I have been on a few military trials which generated ridiculous stories in the press of UFO activity. Any plane that wanders into controlled airspace and is not identified is a UFO. My brother (retired ATC) has seen many, many 'UFOs'. Some folks believe the earth is flat, some think it's only 5000 years old. Others believe aliens walk amongst us. Each to their own I say. But to believe blindly because you 'want it to be true' is just plain silly. And why is it in a time when high resolution cameras have been around for years we still cannot get a good, clear, believable picture of a UFO?