Sept 27, 2010 (CNN) Seven former U.S. Air Force personnel gathered in Washington Monday to recount UFO sightings over nuclear weapons facilities in decades past – accounts that a UFO researcher says show extraterrestrial beings are interested in the world’s nuclear arms race and may be sending humans a message.  At a news conference at the National Press Club, the six former officers and one ex-enlisted man recalled either personal sightings or reports from subordinates and others of UFOs hovering over nuclear missile silos or nuclear weapons storage areas in the 1960s, '70s and '80s. Three of the former Air Force officers – though they hadn’t seen the UFOs themselves - told reporters that UFOs hovering over silos around Montana’s Malmstrom Air Force Base in 1967 appeared to have temporarily deactivated some of the nuclear missiles. Much of the testimony already has appeared in books, websites and elsewhere. But UFO researcher and author Robert Hastings, who organized the news conference, said the time has come for the U.S. government to acknowledge the UFO visits. “I believe - these gentlemen believe - that this planet is being visited by beings from another world, who for whatever reason have taken an interest in the nuclear arms race which began at the end of World War II,” said Hastings, who added that more than 120 former military personnel have told him about UFOs visiting nuclear sites. “Regarding the missile shutdown incidents, my opinion … is that whoever are aboard these craft are sending a signal to both Washington and Moscow, among others, that we are playing with fire – that the possession and threatened use of nuclear weapons potentially threatens the human race and the integrity of the planetary environment,” he said. Former Air Force Capt. Robert Salas – who has written a book about the Montana incidents – said he was underground when a UFO hovered over his missile silo in March 1967, and therefore couldn’t see it. He said one of h...