If aliens do exist, the U.S. government invented them
Which means the male aliens look like Dwight Eisenhower, and the female ones look like Richard Nixon.
We know this because the Air Force shows them off. This video shows an Air Force F-35 Stealth Fighter doing a night-time vertical land. But as it takes off, you see why they look like UFOs. Which is why the government invented aliens. Our logic is foolproof.