A treasure trove of files once owned by the U.S. Air Force and focusing on Unidentified Flying Objects (UFO) has just been declassified and is now on the web.

The complete set of files is known as Project Blue Book, a fabled collection of documents pertaining UFO sightings and investigations.

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Alien enthusiasts and investigators alike have been frustrated as to what the Air Force might know about UFOs.

We now know what these files contain as 130,000 pages of declassified UFO records were uploaded to the internet.

The files came out in "The Black Vault," the online database of UFO enthusiast John Greenewald last January 12.

For two decades, Greenewald has been filing Freedom of Information Act requests for government files on UFOs and other such phenomena.

Apart from Project Blue Book, he also uploaded files on Blue Book's predecessors, Project Sign and Project Grudge.

The insights contained in Project Blue Book originated from the Wright-Patterson Air Force Base in Ohio. In a 12-year period between 1947 and 1969, the documents contained records of 12,618 sightings of strange phenomena.

About 701 of these phenomena still remain unidentified to this day.

A 1985 fact sheet from the same airbase was posted online by the National Archives.

This document stated the Air Force discontinued any UFO investigations since they believed that no UFO reported or investigated was ever deemed as a threat to the country's national security.

It also adds there is no evidence suggesting any of the sightings were categorized as extraterrestrial vehicles.

The collection includes more than 10,000 cases. Curiously, the documents lack any indication of the alleged crash of an alien spacecraft at Roswell, New Mexico in 1947.

Roswell does pop up several times in the reports, however. There are a collection of photographs of Roswell, several of which are of lights in the sky in 1949.

The National Archives maintains it "has been unable to locate any documentation among the Project BLUE BOOK records which discuss the 1947 incident in Roswell, New Mexico."

TagsUFO, Air Force, Project Blue Book, The Black Vault, John Greenewald