A group of about 20 former government workers, many of them military and security officials ... stepped forward on Wednesday to say they had witnessed evidence of aliens and unidentified flying objects and called for congressional hearings about such sightings. These testimonies establish once and for all that we are not alone," said Steven Greer, director of the Disclosure Project, a nonprofit research organization dedicated to disclosing alleged alien sightings. Greer, who organized the program at the National Press Club in Washington, argued that the United States and other governments have known about UFOs for at least 50 years and have been keeping the information secret. Greer said there were some 400 witnesses who claim to have firsthand experience with UFO sightings or alien evidence, and are willing to testify before Congress. Among them is Daniel Sheehan, a well-known Washington lawyer who is acting as counsel for members of Greer's group. Sheehan told reporters that during the Carter administration he found out about government-held UFO information that then-CIA Director George Bush, father of the current president, would not release. Sheehan said he was then led into the National Archives, where he was shown photographs of captured UFOs, complete with what appeared to be alien writing symbols. Former Air Force Maj. George Filer III told reporters that when he was at McGuire Air Force Base in New Jersey, an alien craft came down, and an alien got out and was shot by a military policeman. "Our security police went out there and found him at the end of the runway dead," Filer said.