The Air Force has sent its commands a warning to treat sightings of unidentified flying objects as serious business" directly related to the nation's defense, it was learned today. An Air Force spokesman confirmed issuance of the directive after portions of it were made public by a private flying saucer group. The new regulations were issued by the Air Force inspector general Dec. 24. Existence of the document was revealed by the National Investigations Committee on Aerial Phenomena [NICAP]. The privately financed committee accused the Air Force of deception in publicly describing reports of unidentified flying objects as delusions and hoaxes while sending the private admonition to its commands. Vice Admiral R. H. Hillenkoetter (Ret.), a committee board member and former director of the Central Intelligence Agency, said ... "It is time for the truth to be brought out in open Congressional hearings. Behind the scenes, high-ranking Air Force officers are soberly concerned about the UFOs. But through official secrecy and ridicule, many citizens are led to believe the unknown flying objects are nonsense," the retired admiral said. He charged that "to hide the facts, the Air Force has silenced its personnel.