The story of how aliens apparently visited NATO's main European nuclear weapons dump, faced off with the Bentwaters chief airman, shone a beam into the nuclear bunker, perhaps abducted an airman, then left.
A certain amount of controversy surrounds this account, unsurprisingly. One of the authors was a witness to the third of the three nights events at the Bentwaters US air force base, where the action apparently kicked off.
Jacques Vallee, in Revelations, reckons it was some kind of artificially created situation. Senior air force man Charles Halt is quoted in this book as saying that theory is "BS". Meanwhile, the Ministry of Defence is quoted as saying that UFOs are simply a product of the imagination. So, was it all a National Security Agency training exercise? Or do aliens come and go and fiddle around with NATO nukes as they so please?