Public 
                      USAF UFO studies were first initiated under Project Sign 
                      at the end of 1947, following many widely publicized UFO 
                      reports (see Kenneth 
                      Arnold). Project Sign was initiated specifically 
                      at the request of General 
                      Nathan Twining, chief of the Air Force Materiel 
                      Command at Wright-Patterson Air Force Base. Wright-Patterson 
                      was also to be the home of Project Sign and all subsequent 
                      official USAF public investigations.  
                      Sign 
                        was officially inconclusive regarding the cause of the 
                        sightings. However, according to US Air Force Captain 
                        Edward J. Ruppelt (the first director of 
                        Project Blue Book), Sign's initial intelligence estimate 
                        (the so-called Estimate of the Situation) written in the 
                        late summer of 1948, concluded that the flying saucers 
                        were real craft, were not made by either the Soviet Union 
                        or United States, and were likely extraterrestrial in 
                        origin. This estimate was forwarded to the Pentagon, but 
                        subsequently ordered destroyed by Gen. Hoyt Vandenberg, 
                        USAF Chief of Staff, citing a lack of physical proof. 
                        Vandenberg subsequently dismantled Project Sign.
                      Project 
                        Sign was succeeded at the end of 1948 by Project Grudge, 
                        which was criticized as having a debunking mandate. Ruppelt 
                        referred to the era of Project Grudge as the "dark 
                        ages" of early USAF UFO investigation. Grudge concluded 
                        that all UFOs were natural phenomena or other misinterpretations, 
                        although it also stated that 23 percent of the reports 
                        could not be explained.
                      Captain 
                        Ruppelt era
                      According 
                        to Captain Edward J. Ruppelt, by the end of 1951, several 
                        high-ranking, very influential USAF generals were so dissatisfied 
                        with the state of Air Force UFO investigations that they 
                        dismantled Project Grudge and replaced it with Project 
                        Blue Book in March 1952. One of these men was Gen. 
                        Charles P. Cabell. Another important change came when 
                        General William Garland joined Cabell's staff; Garland 
                        thought the UFO question deserved serious scrutiny because 
                        he had witnessed a UFO.
                      The 
                        new name, Project Blue Book, was selected to refer to 
                        the blue booklets used for testing at some colleges and 
                        universities. The name was inspired, said Ruppelt, by 
                        the close attention that high-ranking officers were giving 
                        the new project; it felt as if the study of UFOs was as 
                        important as a college final exam. Blue Book was also 
                        upgraded in status from Project Grudge, with the creation 
                        of the Aerial Phenomenon Branch.
                      Ruppelt 
                        was the first head of the project. He was an experienced 
                        airman, having been decorated for his efforts with the 
                        Army Air Corps during World War II, and having afterward 
                        earned an aeronautics degree. He officially coined the 
                        term "Unidentified Flying Object", to 
                        replace the many terms ("flying saucer", "flying 
                        disk" and so on) the military had previously used; 
                        Ruppelt thought that "unidentified flying object" 
                        was a more neutral and accurate term. Ruppelt resigned 
                        from the Air Force some years later, and wrote the book 
                         The Report on Unidentified Flying Objects, 
                        which described the study of UFOs by United States Air 
                        Force from 1947 to 1955. American scientist Michael 
                        D. Swords wrote that "Ruppelt would 
                        lead the last genuine effort to analyze UFOs".
                      Ruppelt 
                        implemented a number of changes: He streamlined the manner 
                        in which UFOs were reported to (and by) military officials, 
                        partly in hopes of alleviating the stigma and ridicule 
                        associated with UFO witnesses. Ruppelt also ordered the 
                        development of a standard questionnaire for UFO witnesses, 
                        hoping to uncover data which could be subject to statistical 
                        analysis. He commissioned the Battelle Memorial Institute 
                        to create the questionnaire and computerize the data. 
                        Using case reports and the computerized data, Battelle 
                        then conducted a massive scientific and statistical study 
                        of all Air Force UFO cases, completed in 1954 and known 
                        as "Project 
                        Blue Book Special Report No. 14".
                      Knowing 
                        that factionalism had harmed the progress of Project Sign, 
                        Ruppelt did his best to avoid the kinds of open-ended 
                        speculation that had led to Sign's personnel being split 
                        among advocates and critics of the extraterrestrial hypothesis. 
                        As Michael Hall writes, "Ruppelt not only took the 
                        job seriously but expected his staff to do so as well. 
                        If anyone under him either became too skeptical or too 
                        convinced of one particular theory, they soon found themselves 
                        off the project." In his book, Ruppelt reported that 
                        he fired three personnel very early in the project because 
                        they were either "too pro" or "too con" 
                        one hypothesis or another. Ruppelt sought the advice of 
                        many scientists and experts, and issued regular press 
                        releases (along with classified monthly reports for military 
                        intelligence).
                      Each 
                        U.S. Air Force Base had a Blue Book officer to collect 
                        UFO reports and forward them to Ruppelt. During most of 
                        Ruppelt's tenure, he and his team were authorized to interview 
                        any and all military personnel who witnessed UFOs, and 
                        were not required to follow the chain of command. This 
                        unprecedented authority underlined the seriousness of 
                        Blue Book's investigation.
                      Under 
                        Ruppelt's direction, Blue Book investigated a number of 
                        well-known UFO cases, including the so-called Lubbock 
                        Lights, and a widely publicized 1952 radar/visual case 
                        over Washington D.C.. According to Jacques Vallee, Ruppelt 
                        started the trend, largely followed by later Blue Book 
                        investigations, of not giving serious consideration to 
                        numerous reports of UFO landings and/or interaction with 
                        purported UFO occupants.
                      Astronomer 
                        Dr. 
                        J. Allen Hynek was the scientific consultant 
                        of the project, as he had been with Projects Sign and 
                        Grudge. He worked for the project up to its termination 
                        and initially created the categorization which has been 
                        extended and is known today as Close Encounters. 
                        He was a pronounced skeptic when he started, but said 
                        that his feelings changed to a more wavering skepticism 
                        during the research, after encountering a minority of 
                        UFO reports he thought were unexplainable.
                      Ruppelt 
                        left Blue Book in February 1953 for a temporary reassignment. 
                        He returned a few months later to find his staff reduced 
                        from more than ten, to two subordinates. Frustrated, Ruppelt 
                        suggested that an Air Defense Command unit (the 4602nd 
                        Air Intelligence Service Squadron) be charged with UFO 
                        investigations.
                      Robertson 
                        Panel
                      In 
                        July 1952, after a build-up of hundreds of sightings over 
                        the previous few months, a series of radar detections 
                        coincident with visual sightings were observed near the 
                        National Airport in Washington, D.C. (see 1952 
                        Washington D.C. UFO incident). Future Arizona 
                        Senator and 2008 presidential nominee, the late, John 
                        McCain is alleged to be one of these witnesses.
                      After 
                        much publicity, these sightings led the Central Intelligence 
                        Agency to establish a panel of scientists headed by Dr. 
                        H. P. Robertson, a physicist of the California Institute 
                        of Technology, which included various physicists, meteorologists, 
                        and engineers, and one astronomer (Hynek). The Robertson 
                        Panel first met on January 14, 1953 in order to formulate 
                        a response to the overwhelming public interest in UFOs.
                      Ruppelt, 
                        Hynek, and others presented the best evidence, including 
                        movie footage, that had been collected by Blue Book. After 
                        spending 12 hours reviewing 6 years of data, the Robertson 
                        Panel concluded that most UFO reports had prosaic explanations, 
                        and that all could be explained with further investigation, 
                        which they deemed not worth the effort.
                      In 
                        their final report, they stressed that low-grade, unverifiable 
                        UFO reports were overloading intelligence channels, with 
                        the risk of missing a genuine conventional threat to the 
                        U.S. Therefore, they recommended the Air Force de-emphasize 
                        the subject of UFOs and embark on a debunking campaign 
                        to lessen public interest. They suggested debunkery through 
                        the mass media, including Walt Disney Productions, and 
                        using psychologists, astronomers, and celebrities to ridicule 
                        the phenomenon and put forward prosaic explanations. Furthermore, 
                        civilian UFO groups "should be watched because of 
                        their potentially great influence on mass thinking ... 
                        The apparent irresponsibility and the possible use of 
                        such groups for subversive purposes should be kept in 
                        mind."
                      It 
                        is the conclusion of many researchers that the Robertson 
                        Panel was recommending controlling public opinion through 
                        a program of official propaganda and spying. They also 
                        believe these recommendations helped shape Air Force policy 
                        regarding UFO study not only immediately afterward, but 
                        also into the present day. There is evidence that the 
                        Panel's recommendations were being carried out at least 
                        two decades after its conclusions were issued.
                      In 
                        December 1953, Joint Army-Navy-Air Force Regulation number 
                        146 made it a crime for military personnel to discuss 
                        classified UFO reports with unauthorized persons. Violators 
                        faced up to two years in prison and/or fines of up to 
                        $10,000.
                      Aftermath 
                        of Robertson Panel
                      In 
                        his book, Ruppelt described the demoralization of the 
                        Blue Book staff and the stripping of their investigative 
                        duties following the Robertson Panel jurisdiction.
                      As 
                        an immediate consequence of the Robertson Panel recommendations, 
                        in February 1953, the Air Force issued Regulation 200-2, 
                        ordering air base officers to publicly discuss UFO incidents 
                        only if they were judged to have been solved, and to classify 
                        all the unsolved cases to keep them out of the public 
                        eye.
                      The 
                        same month, investigative duties started to be taken on 
                        by the newly formed 4602nd Air Intelligence Squadron (AISS) 
                        of the Air Defense Command. The 4602nd AISS was assigned 
                        the task of investigating only the most important UFO 
                        cases with intelligence or national security implications. 
                        These cases were deliberately siphoned away from Blue 
                        Book, leaving Blue Book to deal with the more trivial 
                        reports.
                      General 
                        Nathan Twining, who started Project Sign in 1947, was 
                        now Air Force Chief of Staff. In August 1954, he was to 
                        further codify the responsibilities of the 4602nd AISS 
                        by issuing an updated Air Force Regulation 200-2. In addition, 
                        UFOs (called "UFOBs") were defined as "any 
                        airborne object which by performance, aerodynamic characteristics, 
                        or unusual features, does not conform to any presently 
                        known aircraft or missile type, or which cannot be positively 
                        identified as a familiar object." Investigation of 
                        UFOs was stated to be for the purposes of national security 
                        and to ascertain "technical aspects." AFR 200-2 
                        again stated that Blue Book could discuss UFO cases with 
                        the media only if they were regarded as having a conventional 
                        explanation. If they were unidentified, the media was 
                        to be told only that the situation was being analyzed. 
                        Blue Book was also ordered to reduce the number of unidentified 
                        to a minimum.
                      All 
                        this work was done secretly. The public face of Blue Book 
                        continued to be the official Air Force investigation of 
                        UFOs, but the reality was it had essentially been reduced 
                        to doing very little serious investigation, and had become 
                        almost solely a public relations outfit with a debunking 
                        mandate. To cite one example, by the end of 1956, the 
                        number of cases listed as unsolved had dipped to barely 
                        0.4 percent, from the 20 to 30% only a few years earlier.
                      Eventually, 
                        Ruppelt requested reassignment; at his departure in August 
                        1953, his staff had been reduced from more than ten (precise 
                        numbers of personnel varied) to just two subordinates 
                        and himself. His temporary replacement was a non-commissioned 
                        officer. Most who succeeded him as Blue Book director 
                        exhibited either apathy or outright hostility to the subject 
                        of UFOs, or were hampered by a lack of funding and official 
                        support.
                      UFO 
                        investigators often regard Ruppelt's brief tenure at Blue 
                        Book as the high-water mark of public Air Force investigations 
                        of UFOs, when UFO investigations were treated seriously 
                        and had support at high levels. Thereafter, Project Blue 
                        Book descended into a new "Dark Ages" from which 
                        many UFO investigators argue it never emerged. However, 
                        Ruppelt later came to embrace the Blue Book perspective 
                        that there was nothing extraordinary about UFOs; he even 
                        labeled the subject a "Space Age Myth."
                      Captain 
                        Hardin era
                      In 
                        March 1954, Captain Charles Hardin was appointed the head 
                        of Blue Book; however, the 4602nd conducted most UFO investigations, 
                        and Hardin did not object. Ruppelt wrote that Hardin "thinks 
                        that anyone who is even interested [in UFOs] is crazy. 
                        They bore him."
                      In 
                        1955, the Air Force decided that the goal of Blue Book 
                        should not be to investigate UFO reports, but to minimize 
                        the number of unidentified UFO reports. By late 1956, 
                        the number of unidentified sightings had dropped from 
                        the 20-25% of the Ruppelt era, to less than 1%.
                      Captain 
                        Gregory era
                      Captain 
                        George T. Gregory took over as Blue Book's director in 
                        1956. Clark writes that Gregory led Blue Book "in 
                        an even firmer anti-UFO direction than the apathetic Hardin." 
                        The 4602nd was dissolved, and the 1066th Air Intelligence 
                        Service Squadron was charged with UFO investigations.
                      In 
                        fact, there was actually little or no investigation of 
                        UFO reports; a revised AFR 200-2 issued during Gregory's 
                        tenure emphasized that unexplained UFO reports must be 
                        reduced to a minimum.
                      One 
                        way that Gregory reduced the number of unexplained UFOs 
                        was by simple reclassification. "Possible cases" 
                        became "probable", and "probable" 
                        cases were upgraded to certainties. By this logic, a possible 
                        comet became a probable comet, while a probable comet 
                        was flatly declared to have been a misidentified comet. 
                        Similarly, if a witness reported an observation of an 
                        unusual balloon-like object, Blue Book usually classified 
                        it as a balloon, with no research and qualification. These 
                        procedures became standard for most of Blue Book's later 
                        investigations; see Hynek's comments below.
                      Major 
                        Friend era
                      Major 
                        Robert J. Friend was appointed the head of Blue Book in 
                        1958. Friend made some attempts to reverse the direction 
                        Blue Book had taken since 1954. Clark writes that "Friend's 
                        efforts to upgrade the files and catalog sightings according 
                        to various observed statistics were frustrated by a lack 
                        of funding and assistance."
                      Heartened 
                        by Friend's efforts, Hynek organized the first of several 
                        meetings between Blue Book staffers and ATIC personnel 
                        in 1959. Hynek suggested that some older UFO reports should 
                        be reevaluated, with the ostensible aim of moving them 
                        from the "unknown" to the "identified" 
                        category. Hynek's plans came to naught.
                      During 
                        Friend's tenure, ATIC contemplated passing oversight of 
                        Blue Book to another Air Force agency, but neither the 
                        Air Research and Development Center, nor the Office of 
                        Information for the Secretary of the Air Force was interested.
                      In 
                        1960, there were U.S. Congressional hearings regarding 
                        UFOs. Civilian UFO research group NICAP had publicly charged 
                        Blue Book with covering up UFO evidence, and had also 
                        acquired a few allies in the U.S. Congress. Blue Book 
                        was investigated by the Congress and the CIA, with critics 
                         most notably the civilian UFO group NICAP asserting 
                        that Blue Book was lacking as a scientific study. In response, 
                        ATIC added personnel (increasing the total personnel to 
                        three military personnel, plus civilian secretaries) and 
                        increased Blue Book's budget. This seemed to mollify some 
                        of Blue Book's critics, but it was only temporary. A few 
                        years later, the criticism would be even louder.
                      By 
                        the time he was transferred from Blue Book in 1963, Friend 
                        thought that Blue Book was effectively useless and ought 
                        to be dissolved, even if it caused an outcry amongst the 
                        public.
                      Major 
                        Quintanilla era
                      Major 
                        Hector Quintanilla took over as Blue Book's leader in 
                        August 1963. He largely continued the debunking efforts, 
                        and it was under his direction that Blue Book received 
                        some of its sharpest criticism. UFO researcher Jerome 
                        Clark goes so far as to write that, by this time, Blue 
                        Book had "lost all credibility."
                      Physicist 
                        and UFO researcher Dr. 
                        James E. McDonald once flatly declared 
                        that Quintanilla was "not competent" from either 
                        a scientific or an investigative perspective, although 
                        he also stressed that Quintanilla "shouldn't be held 
                        accountable for it," as he was chosen for his position 
                        by a superior officer, and was following orders in directing 
                        Blue Book.
                      Blue 
                        Book's explanations of UFO reports were not universally 
                        accepted, however, and critics  including some scientists 
                         suggested that Project Blue Book performed questionable 
                        research or, worse, was perpetrating cover up. This criticism 
                        grew especially strong and widespread in the 1960s.
                      Take, 
                        for example, the many mostly nighttime UFO reports from 
                        the midwestern and southeastern United States in the summer 
                        of 1965: Witnesses in Texas reported "multicolored 
                        lights" and large aerial objects shaped like eggs 
                        or diamonds. The Oklahoma Highway Patrol reported that 
                        Tinker Air Force Base (near Oklahoma City) had tracked 
                        up to four UFOs simultaneously, and that several of them 
                        had descended very rapidly: from about 22,000 feet to 
                        about 4,000 feet in just a few seconds, an action well 
                        beyond the capabilities of conventional aircraft of the 
                        era. John Shockley, a meteorologist from Wichita, Kansas, 
                        reported that, using the state Weather Bureau radar, he 
                        tracked a number of odd aerial objects flying at altitudes 
                        between about 6,000 and 9,000 feet. These and other reports 
                        received wide publicity.
                      Project 
                        Blue Book officially determined the witnesses had mistaken 
                        Jupiter or bright stars (such as Rigel or Betelgeuse) 
                        for something else.
                      Blue 
                        Book's explanation was widely criticized as inaccurate. 
                        Robert Riser, director of the Oklahoma Science and Art 
                        Foundation Planetarium offered a strongly worded rebuke 
                        of Project Blue Book that was widely circulated: "That 
                        is as far from the truth as you can get. These stars and 
                        planets are on the opposite side of the earth from Oklahoma 
                        City at this time of year. The Air Force must have had 
                        its star finder upside-down during August."
                      A 
                        newspaper editorial from the Richmond News Leader opined 
                        that "Attempts to dismiss the reported sightings 
                        under the rationale as exhibited by Project Bluebook won't 
                        solve the mystery ... and serve only to heighten the suspicion 
                        that there's something out there that the air force doesn't 
                        want us to know about", while a Wichita-based UPI 
                        reporter noted that "Ordinary radar does not pick 
                        up planets and stars."
                      Another 
                        case that Blue Book's critics seized upon was the so-called 
                        Portage 
                        County UFO Chase, which began at about 
                        5.00 am, near Ravenna, Ohio on April 17, 1966. Police 
                        officers Dale Spaur and Wilbur Neff spotted what they 
                        described as a disc-shaped, silvery object with a bright 
                        light emanating from its underside, at about 1000 feet 
                        in altitude. They began following the object (which they 
                        reported sometimes descended as low as 50 feet), and police 
                        from several other jurisdictions were involved in the 
                        pursuit. The chase ended about 30 minutes later near Freedom, 
                        Pennsylvania, some 85 miles away.
                      The 
                        UFO chase made national news, and the police submitted 
                        detailed reports to Blue Book. Five days later, following 
                        brief interviews with only one of the police officers 
                        (but none of the other ground witnesses), Blue Book's 
                        director, Major Hector Quintanilla, announced their conclusions: 
                        The police (one of them an Air Force gunner during the 
                        Korean War) had first chased a communications satellite, 
                        then the planet Venus.
                      This 
                        conclusion was widely derided, and police officers strenuously 
                        rejected it. In his dissenting conclusion, Hynek described 
                        Blue Book's conclusions as absurd: in their reports, several 
                        of the police had unknowingly described the moon, Venus 
                        and the UFO, though they unknowingly described Venus as 
                        a bright "star" very near the moon. Ohio Congressman 
                        William Stanton said that "The Air Force has suffered 
                        a great loss of prestige in this community ... Once people 
                        entrusted with the public welfare no longer think the 
                        people can handle the truth, then the people, in return, 
                        will no longer trust the government."
                      In 
                        September 1968, Hynek received a letter from Colonel Raymond 
                        Sleeper of the Foreign Technology Division. Sleeper noted 
                        that Hynek had publicly accused Blue Book of shoddy science, 
                        and further asked Hynek to offer advice on how Blue Book 
                        could improve its scientific methods. Hynek was to later 
                        declare that Sleeper's letter was "the first time 
                        in my 20 year association with the air force as scientific 
                        consultant that I had been officially asked for criticism 
                        and advice [regarding] ... the UFO problem."
                      Hynek 
                        wrote a detailed response, dated October 7, 1968, suggesting 
                        several areas where Blue Book could improve. In part, 
                        he wrote:
                     
                     
                      Despite 
                        Sleeper's request for criticism, none of Hynek's commentary 
                        resulted in any substantial changes in Blue Book.
                      Quintanilla's 
                        own perspective on the project is documented in his manuscript, 
                        "UFOs, 
                        An Air Force Dilemma." Lt. Col Quintanilla 
                        wrote the manuscript in 1975, but it was not published 
                        until after his death in 1998. Quintanilla states in the 
                        text that he personally believed it arrogant to think 
                        human beings were the only intelligent life in the universe. 
                        Yet, while he found it highly likely that intelligent 
                        life existed beyond earth, he had no hard evidence of 
                        any extra terrestrial visitation.
                      Congressional 
                        hearing
                      In 
                        1966, a string of UFO sightings in Massachusetts and New 
                        Hampshire provoked a Congressional Hearing by the House 
                        Committee on Armed Services. According to attachments 
                        to the hearing, the Air Force had at first stated that 
                        the sightings were the result of a training exercise happening 
                        in the area. But NICAP, the National Investigations Committee 
                        on Aerial Phenomena, reported that there was no record 
                        of a plane flying at the time the sightings occurred. 
                        Another report alleged that the UFO was actually a flying 
                        billboard advertising gasoline. Raymond Fowler (of NICAP) 
                        added his own interviews with the locals, who saw Air 
                        Force officers confiscating newspapers with the story 
                        of UFOs and telling them not to report what they had seen. 
                        Two police officers who had witnessed the UFOs, Eugene 
                        Bertrand and David Hunt, wrote a letter to Major Quintanilla 
                        stating that they felt their reputations were destroyed 
                        by the Air Force. "It was impossible to mistake what 
                        we saw for any kind of military operation, regardless 
                        of altitude," the irritated officers wrote, adding 
                        that there was no way it could have been a balloon or 
                        helicopter. According to Secretary Harold Brown of the 
                        Air Force, Blue Book consisted of three steps: investigation, 
                        analysis, and the distribution of information gathered 
                        to interested parties. After Brown gave permission, the 
                        press were invited into the hearing. By the time of the 
                        hearing, Blue Book had identified and explained 95% of 
                        the reported UFO sightings. None of these were extraterrestrial 
                        or a threat to national security. Brown himself proclaimed, 
                        "I know of no one of scientific standing or executive 
                        standing with a detailed knowledge of this, in our organization 
                        who believes that they came from extraterrestrial sources." 
                        Dr. J. Allen Hynek, a science consultant to Blue Book, 
                        suggested in an unedited statement that a "civilian 
                        panel of physical and social scientists" be formed 
                        "for the express purpose of determining whether a 
                        major problem really exist" in regards to UFOs. Hynek 
                        remarked that he has "not seen any evidence to confirm" 
                        extraterrestrials, "nor do I know any competent scientist 
                        who has, or who believes that any kind of extraterrestrial 
                        intelligence is involved."
                      Condon 
                        Committee
                      Criticism 
                        of Blue Book continued to grow through the mid-1960s. 
                        NICAP's membership ballooned to about 15,000, and the 
                        group charged the U.S. Government with a cover-up of UFO 
                        evidence.
                      Following 
                        U.S. Congressional hearings, the Condon Committee was 
                        established in 1966, ostensibly as a neutral scientific 
                        research body. However, the Committee became mired in 
                        controversy, with some members charging director Edward 
                        U. Condon with bias, and critics would question the validity 
                        and the scientific rigor of the Condon Report.
                      In 
                        the end, the Condon Committee suggested that there was 
                        nothing extraordinary about UFOs, and while it left a 
                        minority of cases unexplained, the report also argued 
                        that further research would not be likely to yield significant 
                        results.
                      End
                      In 
                        response to the Condon Committee's conclusions, Secretary 
                        of the Air Force Robert C. Seamans, Jr. announced that 
                        Blue Book would soon be closed, because further funding 
                        "cannot be justified either on the grounds of national 
                        security or in the interest of science." The last 
                        publicly acknowledged day of Blue Book operations was 
                        December 17, 1969. However, researcher Brad Sparks, citing 
                        research from the May, 1970 issue of NICAP's UFO Investigator, 
                        reports that the last day of Blue Book activity was actually 
                        January 30, 1970. According to Sparks, Air Force officials 
                        wanted to keep the Air Force's reaction to the UFO problem 
                        from overlapping into a fourth decade, and thus altered 
                        the date of Blue Book's closure in official files.
                      Blue 
                        Book's files were sent to the Air Force Archives at Maxwell 
                        Air Force Base in Alabama. Major David Shea was to later 
                        claim that Maxwell was chosen because it was "accessible 
                        yet not too inviting."
                      Ultimately, 
                        Project Blue Book stated that UFOs sightings were generated 
                        as a result of:
                     
                     
                      Despite 
                        this, the summary section of the Battelle Institute's 
                        final report declared it was "highly improbable that 
                        any of the reports of unidentified aerial objects ... 
                        represent observations of technological developments outside 
                        the range of present-day knowledge." A number of 
                        researchers, including Dr. Bruce Maccabee, who extensively 
                        reviewed the data, have noted that the conclusions of 
                        the analysts were usually at odds with their own statistical 
                        results, displayed in 240 charts, tables, graphs and maps. 
                        Some conjecture that the analysts may simply have had 
                        trouble accepting their own results or may have written 
                        the conclusions to satisfy the new political climate within 
                        Blue Book following the Robertson Panel.
                      When 
                        the Air Force finally made Special Report #14 public in 
                        October 1955, it was claimed that the report scientifically 
                        proved that UFOs did not exist. Critics of this claim 
                        note that the report actually proved that the "unknowns" 
                        were distinctly different from the "knowns" 
                        at a very high statistical significance level. The Air 
                        Force also incorrectly claimed that only 3% of the cases 
                        studied were unknowns, instead of the actual 
                        22%. They further claimed that the residual 
                        3% would probably disappear if more complete data were 
                        available. Critics counter that this ignored the fact 
                        that the analysts had already thrown such cases into the 
                        category of "insufficient information", whereas 
                        both "knowns" and "unknowns" were 
                        deemed to have sufficient information to make a determination. 
                        Also the "unknowns" tended to represent the 
                        higher quality cases, q.e. reports that already had better 
                        information and witnesses.
                      The 
                        result of the monumental BMI study were echoed by a 1979 
                        French GEPAN report which stated that about a quarter 
                        of over 1,600 closely studied UFO cases defied explanation, 
                        stating, in part, "These cases ... pose a real question." 
                        When GEPAN's successor SEPRA closed in 2004, 5,800 cases 
                        had been analyzed, and the percentage of inexplicable 
                        unknowns had dropped to about 14%. The head of SEPRA, 
                        Dr. Jean-Jacques Velasco, found the evidence of extraterrestrial 
                        origins so convincing in these remaining unknowns, that 
                        he wrote a book about it in 2005.
                      Hynek's 
                        criticism
                      Hynek 
                        was an associate member of the Robertson Panel, which 
                        recommended that UFOs needed debunking. A few years later, 
                        however, Hynek's opinions about UFOs changed, and he thought 
                        they represented an unsolved mystery deserving scientific 
                        scrutiny. As the only scientist involved with U.S. Government 
                        UFO studies from the beginning to the end, he could offer 
                        a unique perspective on Projects Sign, Grudge, and Blue 
                        Book.
                      After 
                        what he described as a promising beginning with a potential 
                        for scientific research, Hynek grew increasingly disenchanted 
                        with Blue Book during his tenure with the project, leveling 
                        accusations of indifference, incompetence, and of shoddy 
                        research on the part of Air Force personnel. Hynek notes 
                        that during its existence, critics dubbed Blue Book "The 
                        Society for the Explanation of the Uninvestigated."
                      Blue 
                        Book was headed by Ruppelt, then Captain Hardin, Captain 
                        Gregory, Major Friend, and finally Major Hector Quintanilla. 
                        Hynek had kind words only for Ruppelt and Friend. Of Ruppelt, 
                        he wrote "In my contacts with him, I found him to 
                        be honest and seriously puzzled about the whole phenomenon." 
                        Of Friend, he wrote "Of all the officers I worked 
                        with in Blue Book, Colonel Friend earned my respect. Whatever 
                        private views he may have held, he was a total and practical 
                        realist, and sitting where he could see the scoreboard, 
                        he recognized the limitations of his office but conducted 
                        himself with dignity and a total lack of the bombast that 
                        characterized several of the other Blue Book heads."
                      He 
                        held Quintanilla in especially low regard: "Quintanilla's 
                        method was simple: disregard any evidence that was counter 
                        to his hypothesis." Hynek wrote that during Air Force 
                        Major Hector Quintanilla's tenure as Blue Book's director, 
                        "the flag of the utter nonsense school was flying 
                        at its highest on the mast." Hynek reported that 
                        Sergeant David Moody, one of Quintanilla's subordinates, 
                        "epitomized the conviction-before-trial method. Anything 
                        that he didn't understand or didn't like was immediately 
                        put into the psychological category, which meant 'crackpot'."
                      Hynek 
                        reported bitter exchanges with Moody when the latter refused 
                        to research UFO sightings thoroughly, describing Moody 
                        as "the master of the possible: possible balloon, 
                        possible aircraft, possible birds, which then became, 
                        by his own hand (and I argued with him violently at times) 
                        the probable."
                      
                        Source:
                      https://en.wikipedia.org/wiki/Project_Blue_Book