if this planet was being visited by extraterrestrials, would they really only fly around for people to see on obscure night, mutilate cattle, and muck up peoples crops? you would think if they spent all the time and recourses to travel from wherever they came from they would DO something while they were here. if they didn't want to be seen, you'd think that they would put some of the technology that allows them to travel across solar systems to remaining unseen. the whole notion of other civilizations visiting this planet doesn't add up. the only thing the military is covering up the the experimental project you mistook for an alien space craft, and they could be happier that you think its a UFO.