The loadmaster, who has yet to be named, has broken a 37-year silence about the encounter that he failed to report at the time in December 1980 for fear of ruining his career.

However, the man reported the unexplained case to the Mutual UFO Network (MUFON) yesterday, just days after there were headlines across the globe revealing details about a top secret US Department of Defense five-year probe into the threat posed by UFOs.

Details of the Department of Defense Advanced Aerospace Threat Identification £16.5million secretive programme were exposed after the US Government claimed for years it had not interest in UFOs, something conspiracy theorists refused to believe.

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