The document says:
1. Part of the disk carry crews, others are under remote control.
2. Their mission is peaceful and they are considering to establish on our planet.
3. These visitors are human-like but much longer in size.
4. They have no planet such as we live on earth. They come from their own world, an ethereal world that is linked to our own, but we cannot perceive it.
5. The bodies of the visitors and the craft also, automatically materialize when they arrive to our vibration.
6. The discs posses a type of radiant energy, or a ray, which will easily disintegrate any attacking ship.
7. They can become ethereal and invisible without leaving a trail.
8. They probably cannot be reached by radio, but they can sometimes be caught on the radar.
http://vault.fbi.gov/UFO/UFO%20Part%201%20of%2016/view FBI document proves ‘We are being visited by Aliens and they live here on Earth.’ A while ago the FBI uploaded an interesting pdf document on UFOs and Extraterrestrials on their website ‘The Vault’. An official document, dated July 8, 1947 was delivered to Mr. Hoover, FBI director. Below pdf document – Page 22.