A 1950 FBI memo sent to then FBI Director J. Edgar Hoover about flying saucer revoveries in New Mexico is the most 'in demand' file in the bureau's electronic reading room. The letter was sent by agent Guy Hottel, dated 3/22/1950. The memo states:
" An investigator for the Air Force stated that three so-called flying saucers had been recovered in New Mexico. They were described as being circular in shape with raised centers, approximately 50 feet in diameter. Each one was occupied by three bodies of human shape but only 3 feet tall, dressed in metallic cloth of a very fine texture. Each body was bandaged in a manner similar to the blackout suits used by speed flyers and test pilots.
According to Mr. CENSORED informant, the saucers were found in New Mexico due to the fact that the Government has a very high-powered radar set-up in that area and it is believed the radaar interferes with the controlling mechanism of the saucers.
No futher evaluation was attempted by CENSORED concerning the above."
This memo was filed in the vault in April 2011 due to a 'Freedom Of Information Act' request made to the FBI. The FBI's spin on the memo, as posted on their blog last week was this;
"The Hottel memo does not prove the existence of UFOs. It is simply a second- or third had claim that we never investigated"
'The FBI has only occasionally been involved in investigating reports of UFOs and extraterrestrials. For a few years after the Roswell incident, Director Hoover did order his agents�the request of the Air Force�verify any UFO sightings. That practice ended in July 1950, four months after the Hottel memo, suggesting that our Washington Field Office didn't think enough of that flying saucer story to look into it. '
FBI VAULT UFO - Letter From Guy Hottel
Here's a link to the FBI Records Vault.