There is some really interesting stuff in the Vault and if you have time check the files out yourself.
It seems that former FBI chielf J Edgar hoover, had involvement in the governments Ufo investigations, particularly during his time as head of the FBI in the 1950's.
There are numerous documents referencing his name as FBI director on requests for information on Ufos. The recent Roswell memo has spurred much debate and indicated that Hoover was well aware that a Ufo did infact crash there. Of interest there are also documents on Ufo cases from the National Investigations Committee on Aerial Phenomena (NICAP) and Office of Special Investigations showing the Ufo topic was taken seriously by the US government since the 1940's. Read more
If you have gone over the files please reply to this post or email me any areas of interest.