LARRY KING, HOST: Tonight, have UFOs shut down our government's defense systems? There is evidence that something caused missiles to malfunction during test launches. Former Air Force officers tell their incredible story about the film that was confiscated by the CIA and what was on it and why officials don't want us to see it. Our first guests claim UFOs have activated missile systems at five Air Force Bases in five different states. They also claim a cover-up, that the United States government is keeping the information secret. Robert Hastings [is] author of UFOs and Nukes: Extraordinary Encounters at Nuclear Weapons Sites. He has been investigating sightings at weapon sites for years. Bob Salas is a former captain [in] the United States Air Force. He was at Malstrom Air Force Base in 1967, where there were claims that a UFO caused missiles to malfunction. He's co-author of Faded Giant: the 1967 Missile/UFO Incidents. Bob Jamison is ... a former U.S. Air Force officer. He was at Malstrom, as well, in 1967 and he says his superiors told him UFOs caused the malfunctions. And ... Dr. Bob Jacobs, ... former U.S. Air Force photographic instrumentation officer. A UFO showed up on film that he shot in 1954 at Vandenberg Air Force Base and that was later confiscated by CIA agents. What's your explanation for UFOs at nuclear weapon sites? ROBERT HASTINGS: There are hundreds of declassified documents which indicate that UFOs have demonstrated a distinct and ongoing interest in our nuclear weapons sites. I've also interviewed nearly a hundred [men] who were involved in these incidents at various Air Force bases. This is very widespread.