One of the foundational tenets of faith among UFO believers is that classified documents locked away in some secret government file contain the truth that the Earth has been visited by extra terrestrials. If the experience of researchers in the UK means anything, they're going to be disappointed:
Whatever they were, these phenomena reported to Britain’s Ministry of Defense over the years and made public this month were almost certainly not actual alien aircraft piloted by actual alien beings.Bummer. If you think Clarke's missed something, some of the documents are available online from the National Archives.
'The government has been telling us the truth,' declared David Clarke, a senior lecturer in journalism at Sheffield Hallam University, who has a side interest in U.F.O.’s. 'There are a lot of weird things in the sky, and some of them we can’t explain, but there’s not a shred of evidence for a single alien visitation.'