Many readers will know the name Gary McKinnon, the “Scottish systems administrator and hacker who was accused in 2002 of perpetrating the ‘biggest military computer hack of all time'” (Wikipedia). This link leads to an interview with McKinnon in which he describes an Excel spreadsheet stored away in NASA computers that, he alleges, mentioned “non-terrestrial officers.” McKinnon does not believe these officers are aliens. Rather, he suspects that the U.S. military is running a secret space program.
Let that sink in. If this is true, it would have a lot of explanatory power for UFOs, one that would be very consistent with the “man-made UFO hypothesis.