The UFO Landing Site is a location and reference to the movie (series) Men in Black. There is a UFO standing in the middle of an open field, with 2 characters close to it. 1 of the characters is the Man in Black and the other character is the Alien.
The ray gun is obtainable when the alien is killed. If you and the alien survive the siege, you will receive the car keys to the UFO. There is also a chance that the mission leader will be given a skill boost from the Alien who touches their forehead and uses it as a chance to escape.
The UFO is a rare obtainable vehicle.