Interesting is that what convinced Mr. Hellyer was not secret files he saw when in office, but rather a Peter Jenning's show on UFOs and most of all, Col. Philip Corso's book, "The Day After Roswell", from which he got most of his claims.
Quote:
The 82-year-old Hellyer admitted he had not paid much attention when he was in government in the 1960s to the possibilities that extraterrestrials had visited earth, despite receiving reports of unidentified sightings as part of his job. Only after the year 2000 was his interest sparked by meeting ufologists and reading some of their research material.
....
What really convinced him however seems to have been the book The Day After Roswell, co-written by the late Philip Corso, described as a former Pentagon intelligence officer and member of President Eisenhower’s White House Security Staff for four years. Hellyer told the meeting it was “one of the most fascinating books I have ever read – it is the unimpeachable source of what I am going to say to you today.”
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Corso's book isn't taken seriously by anyone.
source:
http://www.skeptics.ca/news2005.html
Kind of sad. An old guy falling for Corso's book.