Overview
The report commonly called the Condon Report was the final product of the University of Colorado's Scientific Study of Unidentified Flying Objects, a U.S. Air Force-funded project carried out from 1966 to 1968 under the scientific direction of physicist Edward U. Condon. It became one of the most influential documents in the history of official U.S. UFO investigation. Its effect was institutional as much as scientific.
Condon concluded that the previous 21 years of UFO study had added nothing of significance to scientific knowledge and that further extensive study of UFO reports was unlikely to be justified in the expectation of scientific advance. He did not claim that every reported UFO had been positively identified. He did not claim that extraterrestrial life was impossible. He did not argue that no scientist should ever study a specific unusual atmospheric, radar, photographic or perceptual problem that happened to arise through a UFO report. His conclusion was narrower but still powerful:
UFOs, treated as a general research category, did not appear to justify a major continuing scientific programme. Condon Report — Section I, Conclusions and Recommendations That conclusion was subsequently supported by a National Academy of Sciences review panel, which called the Colorado effort a creditable application of scientific methods and agreed that UFO investigation did not deserve high research priority on the available evidence. The Air Force then used the Colorado study, the NAS review, previous UFO investigations and its own Project Blue Book experience as part of the basis for terminating Project Blue Book on 17 December 1969.
National Archives — Project Blue Book fact sheet The report therefore helped close the longest-running formal U.S. Air Force UFO programme. But the Condon Report has remained controversial for nearly six decades. Critics point to:
- an internal 1966 memorandum by project coordinator Robert J. Low that appeared to discuss how the study might be presented as objective while being conducted by researchers with an almost zero expectation of finding anything extraordinary;
- public comments by Condon during the study that critics regarded as prejudicial;
- the dismissal of project staff members David Saunders and Norman Levine after the Low memorandum became part of the dispute;
- disagreement between the report's strongly negative executive conclusions and some individual case analyses that remained unresolved or judged unusual;
- and the question of whether a two-year project can reasonably settle the value of an entire anomalous-reporting field.
Defenders respond that: Both parts of that history matter. The Condon Report should not be described as proof that UFOs do not exist. Nor should it be dismissed simply as a prearranged government cover-up. It was a large, imperfect and historically consequential scientific review whose headline conclusion was much more skeptical than some of its own most interesting case analyses.
The University of Colorado's president J. R. Smiley formally transmitted the completed report to Air Force Secretary Harold Brown on 31 October 1968. The report itself says the project's investigative phase had ended on 1 June 1968 and that the final report was turned over to the Air Force on 31 October for National Academy review and subsequent public release. University of Colorado — 31 October 1968 submission letter
The edition later used by the Defense Technical Information Center states that it reproduces the report submitted to the National Academy of Sciences on 15 November 1968 for scientific review. The NAS panel received the report, reviewed it during November and December, met again in January and completed its assessment in early 1969. Commercial book editions from Dutton and Bantam are bibliographically dated 1969. Google Books — Bantam edition, 1969 The public release is generally dated to January 1969, immediately after completion of the NAS review.
Therefore the best timeline wording is: 31 October 1968 — Condon Report completed and submitted; public release followed in January 1969. The existing 1968 route should remain for site continuity. The article should not imply that the mass-market Bantam edition was published in October 1968.
Commissioning the study
By the mid-1960s, Project Blue Book was under pressure from several directions. The Air Force had accumulated thousands of UFO reports. Many had conventional explanations. Hundreds remained unidentified. Some of those reports came from people the Air Force itself described as intelligent, technically qualified and credible. At the same time, Blue Book's resources were minimal. A September 1965 Air Force memorandum said the programme was being operated with only a very small staff while still carrying responsibility for reports that might, in principle, have implications for air defence.
The public controversy intensified after highly publicised sightings in Michigan in March 1966, where J. Allen Hynek's public suggestion that some reports might be associated with “swamp gas” became a national political embarrassment. Congressman Gerald Ford, whose district included the area, called for stronger investigation. The Air Force Scientific Advisory Board then convened an Ad Hoc Committee to Review Project Blue Book under physicist Brian O'Brien. Its March 1966 report is important because it did not recommend simply shutting the subject down.
The committee said no verified and fully satisfactory case had demonstrated something clearly outside known science and technology. But it also said some Blue Book cases classified as identified had evidence too weak to support positive identification. It recommended that selected universities investigate chosen new cases promptly and in greater depth. Condon Report — Appendix A, O'Brien Committee report That recommendation produced the Colorado project.
Formal independence
The Air Force Office of Scientific Research approached the University of Colorado in 1966. The project's first research contract supplied $313,000 for the first 15 months, beginning 1 November 1966. The contract required that planning, research direction and conclusions be conducted independently of the Air Force. The Air Force was to provide existing records and logistical help when requested. Condon Report — Section II, project origin The University's preface states that complete freedom of scientific design and technique was guaranteed.
University president Smiley later wrote that there had been no Air Force effort to influence the study's conduct or conclusions. Those statements are primary evidence of the formal arrangement and the University's experience. They do not prove that every project member was personally unbiased. Institutional independence from the sponsor and internal intellectual neutrality are different questions. That distinction becomes central in the Low memorandum controversy.
Project leadership
The project was directed by Edward Uhler Condon, one of the most prominent American physicists of his generation. Condon had worked in quantum mechanics, spectroscopy, radar-related research and nuclear physics and had previously directed the National Bureau of Standards. Daniel S. Gillmor edited the final report. Robert J. Low, an assistant dean at Colorado, served as project coordinator. The scientific work involved researchers from several disciplines and external institutions. The report lists cooperation or specialist contributions involving organisations such as:
The project was therefore not simply Condon reading old newspaper stories. It conducted field investigations, reanalysed old cases, tested photographs, examined claimed physical materials, studied radar propagation, reviewed astronaut observations and considered psychological and sociological aspects of UFO reporting.
This is one of the most important points. The Colorado Project was not primarily commissioned to answer: “Do extraterrestrials exist?” Its stated focus was whether deeper study of UFO reports was likely to produce scientific knowledge. That distinction shaped the final conclusion. One could imagine a universe in which extraterrestrial spacecraft occasionally visited Earth but the surviving UFO-report system was so noisy and scientifically poor that studying historical UFO reports still produced little useful knowledge. Conversely, a UFO study could produce valuable discoveries in atmospheric science, perception or radar propagation even if no extraterrestrial craft were present.
Condon framed the programme in terms of research productivity. That is why his principal recommendation concerns whether continued large-scale UFO research was scientifically worthwhile, not a metaphysical declaration that intelligent extraterrestrial life could not exist.
Findings and case work
Case selection
Different secondary sources give different numbers. This is usually a problem of counting definitions. The National Academy of Sciences review states that the final report contained 59 detailed case studies, including 10 older cases that predated the Colorado Project but were considered sufficiently well documented to include. The wider report discussed many additional historical and technical examples. Some later writers count individual incidents embedded in grouped case analyses differently and arrive at larger totals. For UAPRAD, 59 detailed case reports is the cleanest number because it comes directly from the NAS review of the final report.
National Academy review — reproduced by Project 1947 The point is not the precise total. The crucial issue is what those case investigations showed.
Ordinary explanations
A large part of the project supported conventional interpretation. The field investigators repeatedly encountered reports that weakened as better information arrived. Some cases involved: The project's photographic analysis is a useful example. It concluded that many photographs could either be identified as known phenomena, shown to contain serious inconsistencies, or were too weak for quantitative analysis. It also explicitly said that a small residual of interesting photographic cases remained unidentified, while stressing that none independently proved extraordinary aircraft. Condon Report — Section III, Chapter 2, Photographic Evidence This is a more nuanced result than the popular slogan “Condon explained all UFOs.”
The report itself did not say that.
Field investigation
The field study team took a skeptical but recognisably scientific position. Where a report had enough evidence to define what occurred, investigators frequently found an ordinary interpretation. Unresolved current cases were often unresolved because information was inadequate rather than because a highly strange phenomenon survived strong scrutiny. That distinction is important. An investigation can end with “unknown” for at least two very different reasons. There is not enough reliable information to determine what happened. There is substantial reliable information, yet ordinary explanations remain poor. Only the second category provides much leverage for discovering a new phenomenon. The Colorado Project argued that most unresolved material belonged closer to the first category. Condon Report — Section III, Chapter 1, Field Studies
The most famous internal tension in the Condon Report is that some individual investigators wrote conclusions that sound much less dismissive than Condon's opening recommendation. The strongest example is the Lakenheath–Bentwaters radar-visual case of August 1956. The case involved radar observations from U.S. and British military facilities in England, visual reports and an attempted RAF fighter interception. The Colorado analysis explicitly concluded that ordinary or natural explanations could not be ruled out but judged their probability low and said the probability that at least one genuine UFO was involved appeared fairly high.
“Genuine UFO” in that context means a genuinely unidentified event. It does not mean extraterrestrial spacecraft. Condon Report — Case 2, Lakenheath The radar-analysis chapter went further in describing the case as one of the most puzzling radar incidents in the record. It considered anomalous propagation but found significant difficulties with that explanation. Condon Report — Optical and Radar Analyses This case is important because it demonstrates that the report was not written as one uniform debunking narrative. Individual investigators could publish a conclusion that an event remained genuinely puzzling.
Meaning of unexplained cases
Critics sometimes argue: “The report left cases unexplained, therefore Condon's conclusion was logically impossible.” That is too simple. Condon's claim was not that zero unexplained cases existed. His claim was that the record as a whole did not justify a large ongoing research programme in expectation of scientific breakthroughs. A scientist can consistently believe that: That position is logically coherent. The stronger criticism is subtler: Did the report's most interesting residual cases justify a more open recommendation for improved data collection than Condon was willing to give? That is a legitimate methodological debate.
Another frequently lost nuance is that Condon did not recommend a permanent scientific ban. He wrote that scientists with strong, clearly defined specific proposals should receive normal consideration for support. He also identified research areas such as: as legitimate scientific topics that had become relevant through UFO investigation. His objection was to UFO study as a broad standing field, not to all research touching unusual aerial observations. This matters in modern discussions because today's UAP research can be designed around specific measurable questions rather than around the category “UFO” itself.
The Air Force and University had arranged from the beginning for the National Academy of Sciences to conduct an independent assessment of the completed study. The NAS panel was appointed in late October and early November 1968. It began reviewing the report after the final version became available on 15 November 1968. The panel did not conduct its own new UFO investigation. Its charge was to review:
That distinction is essential. The NAS did not independently reinvestigate every Lakenheath, Tremonton or photographic case. It reviewed the Colorado study as a scientific work. The panel concluded that the study's scope was adequate, its methodology and approach were well chosen, and its conclusions were reasonable. It unanimously described the effort as creditable. It agreed that UFO investigation did not warrant high research priority on the evidence available. It also explicitly acknowledged that some UFO sightings remained difficult to explain.
National Academy of Sciences review — Project 1947 reproduction The NAS endorsement substantially strengthened the institutional impact of Condon's conclusions.
Limits of the NAS review
The Academy's review is sometimes described as a second independent scientific investigation that confirmed Condon's individual case solutions. That is inaccurate. The panel itself said it was not tasked with conducting a new UFO study. It evaluated the report. Therefore the NAS review provides strong support for the judgement that the Colorado Project used acceptable scientific methodology overall. It does not provide a fresh independent evidentiary resolution of every case in the report. This distinction matters particularly where critics challenge individual case analyses.
The most damaging controversy surrounding the Colorado Project began before the contract was formally signed. On 9 August 1966, Robert Low wrote an internal memorandum to University officials E. James Archer and Thurston Manning discussing whether Colorado should accept the UFO study. Faculty reaction was poor. Low worried that serious involvement with UFOs could harm the University's scientific reputation. The memorandum discussed a way the project might be structured so that it appeared objective publicly while making clear to the scientific community that it was being conducted by researchers with little expectation of finding a “saucer.”
A surviving reproduction of the memorandum includes Low's now-famous use of the word “trick.” NICAP archive — Robert Low memorandum, 9 August 1966 This is a real document. The controversy is about interpretation.
Critical interpretation
The memo shows the result was being framed before the research began. Under this reading, the study's public claim of complete objectivity was compromised from inception. Low was trying to solve an administrative problem: how could a respected university investigate a stigmatised subject without appearing to endorse flying saucers? Under this interpretation, “trick” meant organisational or presentational challenge rather than a plan to falsify evidence. Both interpretations should be presented. What cannot reasonably be said is that the memorandum is irrelevant. It clearly demonstrates that expected scientific reputation and expected negative results were being discussed before the project began.
The presence of a prejudicial-sounding memo does not prove that every investigator manipulated every result. This is where the final report itself matters. The project: That is inconsistent with a simplistic theory that the entire report was mechanically fabricated to eliminate all anomalies. The stronger criticism is about selection, framing and final synthesis. A research programme can conduct competent individual work while the leadership's prior expectations still influence:
This is the more defensible way to use the Low memorandum. The Colorado Project suffered severe internal tensions. Project scientists David R. Saunders and Norman Levine became associated with the Low memorandum controversy and were dismissed from the project in February 1968. Saunders later co-authored UFOs? Yes! — Where the Condon Committee Went Wrong, presenting a detailed insider critique. The controversy intensified after physicist and atmospheric scientist James E. McDonald, one of the strongest scientific advocates for serious UFO study, learned of the memo and challenged the project leadership.
Civilian UFO organisation NICAP eventually withdrew its cooperation. These events are important to institutional history. They do not automatically invalidate every chapter written by scientists who remained on the project. Nor should Condon's dismissal of staff members be rewritten as proof that they had discovered extraterrestrial evidence. The disagreement was about objectivity, management, research direction and disclosure of an internal memorandum.
Scientific opposition
James E. McDonald became the project's most prominent scientific critic. Unlike many popular UFO advocates, McDonald was an established atmospheric physicist. He reviewed cases, interviewed witnesses, addressed scientific groups and argued that the unexplained residual deserved much more rigorous research. On 29 July 1968, a symposium on UFOs was held before the House Committee on Science and Astronautics. Participants included scientists holding a range of views. Condon read the transcript while preparing the final report and concluded that it did not contain new data sufficient to change the project's findings.
1968 Congressional UFO Symposium — NCAS archive McDonald later argued that the Condon report's headline conclusion was not justified by some of its own case material. That disagreement is historically significant because it demonstrates that scientific opposition to Condon was not limited to nontechnical “believers.” There was a real dispute among technically trained investigators over how much weight to give the unresolved residue.
Hynek’s position
J. Allen Hynek had served as the Air Force's principal scientific consultant to Project Blue Book for many years. His views had shifted significantly since his strongly skeptical work during Project SIGN and GRUDGE. By the late 1960s he believed the Air Force had not created a sufficiently rigorous scientific system for studying the best UFO reports. Hynek criticised the Colorado study after its publication. His later position should also be interpreted carefully. Hynek did not prove that UFOs were extraterrestrial. His central methodological argument was that a small number of high-quality cases remained sufficiently puzzling to justify continuing scientific attention.
That is the most important difference between Hynek and Condon: Condon saw the residual as too unproductive to justify a broad programme; Hynek saw the residual itself as the reason a better programme was needed.
Case studies and conclusions
The Condon Report contains nearly 1,400 pages in its original submitted form. It is not one continuous argument written by one person. Different investigators wrote different sections. The result is inevitably heterogeneous. Critics frequently point to the fact that individual investigators left cases unresolved while Condon's opening pages recommended against further extensive UFO study. That is a genuine tension. But the exact percentage of “unexplained Colorado cases” is often overstated. Different writers count cases and classifications differently.
Some grouped cases contain multiple events. Some cases are unresolved because data are insufficient. Others contain stronger residual anomalies. Therefore UAPRAD should not present one unsupported headline such as “30 percent of Condon's own cases were unexplained” as if the figure were a universally agreed output of the report. The stronger point requires no disputed percentage: The final report contains multiple cases or technical analyses in which the project's own investigators could not provide a satisfactory conventional explanation, including at least one major radar-visual case they regarded as genuinely puzzling.
That is enough to support a nuanced critique of the executive conclusion.
Lakenheath as an example
Lakenheath is especially valuable because the report's own language is difficult to dismiss as mere advocate interpretation. The Colorado investigator found: The analysis considered atmospheric propagation. It also said important aspects of the tracks were not characteristic of such false radar targets. The final case conclusion judged a conventional explanation possible but relatively unlikely. This does not prove an extraterrestrial craft. It does show that the project itself contained evidence it could not comfortably assimilate into an ordinary explanation. That is exactly the kind of case on which Condon and his critics differed over policy.
The photographic study reached a similarly careful result. A substantial fraction of photographs were: The investigators then noted a very small residual of unidentified photographs. They explicitly stated that none was conclusive evidence of extraordinary craft. This is scientifically reasonable. A photograph can remain unidentified because: An unidentified photograph is therefore not necessarily a photograph of an unidentified physical vehicle. The Condon photographic analysis remains useful because it demonstrates why apparently impressive images often have very low scientific information content.
Condon did not treat extraterrestrial life as scientifically absurd. The report discussed the possibility of intelligent life elsewhere in the universe. What it rejected was the inference that the available UFO evidence demonstrated visitation. The NAS review similarly concluded that extraterrestrial visitation was the least likely explanation on the available evidence. This is a crucial distinction. Statements such as “Condon proved aliens do not exist” are false. The report concerned the evidentiary value of UFO reports, not the existence of life elsewhere in the cosmos.
Condon said the project found no basis for the general contention that UFO information was being suppressed through a broad official secrecy system. The project stated that classified missile or radar details affected only a negligible portion of the material it needed and did not change its scientific conclusions. The NAS panel accepted the report's finding on secrecy. That conclusion should be stated as the Colorado/NAS institutional finding. Later historical research has established that governments did classify some UFO-related information because reports intersected with:
Therefore “some UFO records were classified” is demonstrably true. That fact is not equivalent to proof that government possessed extraterrestrial vehicles. Condon's broader dismissal of a secret extraterrestrial evidence system and the existence of classified UFO-related records are not contradictory propositions. Condon argued that the Department of Defense could handle relevant aerial observations through ordinary surveillance and intelligence functions without a special unit such as Project Blue Book. The National Academy review agreed. The Air Force did not shut Blue Book immediately. It continued through most of 1969. On 17 December 1969, the Secretary of the Air Force announced its termination. The Air Force later said the decision was based on:
Air Force Declassification Office — Project Blue Book This is an important causal qualification. It is accurate to say the Condon Report was a major basis for closure. It is too strong to say the University of Colorado alone ordered Blue Book closed. The Air Force made that policy decision. The National Archives fact sheet states that Project Blue Book ultimately received 12,618 reports, of which 701 remained unidentified. National Archives — Project Blue Book The Air Force did not argue that 701 unexplained reports were evidence of extraordinary craft. Its position was that the unresolved cases had not demonstrated:
This is conceptually parallel to Condon's reasoning. A programme can close while leaving unresolved cases if the residual is judged unproductive or nonthreatening. Whether that was the correct policy is separate from whether it was logically possible.
Not literally. Private researchers continued. Academic scientists occasionally published or discussed the subject. Hynek later founded the Center for UFO Studies. James McDonald continued his advocacy until his death in 1971. The American Association for the Advancement of Science held a UFO symposium in December 1969. Researchers continued examining radar, photographs, perception and unusual atmospheric phenomena. But the report had a profound institutional signalling effect. A prestigious university project, followed by a positive NAS review, concluded that general UFO research was unlikely to be scientifically productive.
That made universities, mainstream funding agencies and scientists less likely to invest professional reputation in the field. The extent of that effect is difficult to quantify. It is safer to say that Condon reinforced and formalised scientific skepticism rather than claiming he single-handedly imposed a half-century ban.
Evidence assessment
Scientific validity
A binary answer is not very useful. Different parts deserve different assessments. The National Academy judged the scope adequate. The project covered historical records, field investigations, photographs, radar, psychology, perception, atmospheric science and other related subjects. Much was competent and remains useful. The report contains careful explanations, rigorous photographic criticism and sophisticated discussions of radar and atmospheric propagation. Often poor. Most UFO cases are transient. Investigators arrive after the event. Range, speed and distance are usually uncertain. Original sensor data may not exist. This severely limits scientific inference.
Legitimately controversial. The Low memorandum and Condon's early public attitude make it reasonable to question how open the leadership was to a positive result. More skeptical than some case-level findings. This is the central internal tension. Not demonstrated. Nothing in the report publicly establishes extraterrestrial vehicles, recovered technology or non-human intelligence. The report's failure to explain some cases is not equivalent to proof of those hypotheses.
AARO's 2024 historical review includes the Colorado Project as an important stage in U.S. government UAP history. It summarises the study as concluding that further UFO investigation would not be scientifically fruitful and notes the subsequent National Academy review. AARO also incorporates examples where the Colorado study challenged extraordinary claims from popular UFO literature. AARO — Historical Record Report, Volume I This is useful modern institutional context. It is not an independent replacement for the original report. AARO is itself a contemporary government office interpreting historical government investigations.
For the Condon event, the primary text should remain the controlling source.
The Condon Report is neither the definitive end of the UFO question nor a document that can simply be discarded because its director was skeptical. It was a serious scientific project conducted under real institutional controversy. Its staff explained many cases. Its technical chapters contain enduringly useful work on radar, photography, perception and atmospheric effects. It found no persuasive evidence of extraterrestrial visitation. The National Academy reviewed the report and endorsed its overall scientific approach. Those facts give the report substantial evidentiary weight.
The criticisms are also substantial. Robert Low's pre-contract memorandum created a legitimate appearance that negative expectations shaped the programme before evidence was collected. Project personnel openly fought over objectivity. Two senior staff members were dismissed during that conflict. Some individual investigators reached more open-ended conclusions than Condon's executive summary. Lakenheath is the clearest example: a Colorado investigator regarded the event as a genuine, highly puzzling radar-visual UFO case even though the project leadership concluded that broad UFO research was scientifically unpromising.
That tension cannot be resolved by counting unexplained cases alone. The real disagreement is philosophical and methodological: How much unresolved high-quality evidence is enough to justify a standing research programme? Condon's answer was: not enough was present. Hynek and McDonald answered: the residual itself justified better investigation. The Air Force accepted the Condon/NAS side and closed Blue Book. Modern UAP programmes have, in effect, reopened the methodological question under very different technological conditions. The report therefore belongs on the timeline not because it “debunked UFOs forever.”
It belongs there because it became the most consequential scientific argument for ending the first era of continuous U.S. government UFO investigation.
Chronology
28 September 1965 — Air Force asks for scientific review.
Major General E. B. LeBailly requests an outside scientific assessment of Project Blue Book. 3 February 1966 — O'Brien committee meets.
The Air Force Scientific Advisory Board reviews Blue Book. March 1966 — O'Brien report issued.
The committee says no verified case demonstrates technology outside known science but recommends stronger university-based study of selected new sightings. March 1966 — Michigan sightings intensify political pressure.
Public controversy around Blue Book and Hynek's “swamp gas” explanation increases calls for outside study.
9 August 1966 — Robert Low writes internal memorandum.
The later “Low memo” discusses the reputational and presentational problem of conducting the UFO project with researchers expecting a negative outcome. 31 August 1966 — AFOSR formally approaches Colorado.
The Air Force asks the University to conduct an independent scientific study. October 1966 — Colorado project publicly announced.
Edward Condon becomes scientific director. 1 November 1966 — first contract period begins.
Initial funding is $313,000 for 15 months. 1967 — field and historical investigations expand.
Project teams investigate contemporary cases and reanalyse older Blue Book material.
1967–early 1968 — internal controversy grows.
The Low memorandum circulates among critics and project members. February 1968 — Saunders and Levine dismissed.
The staff conflict over project management and the Low memo becomes public. Spring 1968 — NICAP withdraws cooperation.
The civilian research organisation loses confidence in the project. 1 June 1968 — investigative phase ends.
The project begins assembling its final report. 29 July 1968 — House UFO symposium.
Scientists including advocates of further research present arguments before the House Committee on Science and Astronautics.
31 October 1968 — final report transmitted to Air Force.
University president J. R. Smiley formally submits the completed study. 15 November 1968 — final version available to NAS review panel.
The Academy begins detailed assessment. 2 December 1968 — NAS panel meets.
Members compare initial evaluations. 6 January 1969 — NAS review completed.
The panel finalises its conclusions. 8 January 1969 — NAS transmits its review / press coverage begins.
The Academy endorses the Colorado study's overall methodology and low-priority recommendation.
January 1969 — report released publicly and commercially.
Dutton/Bantam editions make the study widely available. 17 December 1969 — Project Blue Book terminated.
The Air Force cites the Colorado report, NAS review, earlier studies and its own investigative record as grounds for ending the special UFO programme.
Source library
University of Colorado / Edward U. Condon — Scientific Study of Unidentified Flying Objects
Type: Primary scientific report / Air Force-funded independent university study.
The controlling source for the project's methods, case studies, conclusions and recommendations. The original report was submitted in 1968 and publicly published in 1969.
Read the complete NCAS electronic edition
Condon Report — Conclusions and Recommendations
Type: Primary report section authored by Edward Condon.
The central source for the statement that broad further UFO study was unlikely to advance science. It also preserves important qualifications: individual specific research proposals should still be considered, and related atmospheric/perceptual subjects remained legitimate.
Read Section I
University of Colorado — 31 October 1968 submission letter
Type: Primary contemporaneous administrative document.
Establishes the completion/transmission date and the University's statement that the Air Force had not interfered with the research conclusions.
Read the submission letter
Condon Report — Preface
Type: Primary institutional statement.
Explains the Air Force request, independence guarantees and arrangement for later National Academy review.
Read the preface
O'Brien Committee — March 1966 Project Blue Book review
Type: Primary Air Force Scientific Advisory Board report, reproduced in the Condon volume.
Explains why the University study was commissioned. The committee found no verified case outside known science but criticised weak identification standards and recommended more intensive scientific study of selected sightings.
Read Appendix A
PURSUE — DOW-UAP-D092, Department of the Air Force Committee to Review Project Blue Book, 1966–1967
Type: Official 2026 federal release of underlying programme-review material.
Provides additional contemporary documentation surrounding the Air Force scientific-review process that led to the Colorado Project.
Browse PURSUE Release 04
Condon Report — Field Studies
Type: Primary technical analysis.
Important for the project's argument that many extraordinary elements weakened under investigation and that unresolved cases often remained unresolved because of missing information.
Read the field-studies chapter
Condon Report — Photographic Evidence
Type: Primary technical analysis.
Shows that the project's results were more nuanced than “all photographs explained”: many were weak, inconsistent or identifiable, while a small residual remained unidentified without providing conclusive evidence of extraordinary aircraft.
Read the photographic analysis
Condon Report — Case 2, Lakenheath–Bentwaters
Type: Primary project case analysis.
The strongest example of internal tension between Condon's broad recommendation and a project investigator's conclusion. The analyst judged ordinary explanations possible but relatively unlikely and considered the probability of at least one genuine unidentified object fairly high.
Read Case 2
Condon Report — Optical and Radar Analyses
Type: Primary specialist technical analysis.
Contains further assessment of difficult radar cases and describes Lakenheath as one of the most puzzling radar cases on record.
Read the radar analysis
Robert J. Low — memorandum of 9 August 1966
Type: Primary internal University memorandum, preserved through historical UFO archives.
The central evidence in the project's objectivity controversy. It discusses presenting the study publicly as objective while acknowledging an almost zero expectation among likely investigators of finding a saucer. Interpretation of Low's intent remains disputed.
Read the memo reproduction/transcription
National Academy of Sciences — Review of the University of Colorado Report
Type: Independent scientific review of the Colorado report, completed 1969.
The panel reviewed scope, methodology and findings rather than conducting a new UFO investigation. It supported the report's general scientific approach and low-priority recommendation while acknowledging some unexplained cases.
Read a public reproduction
U.S. National Archives — Project Blue Book
Type: Official archival programme history.
Establishes the 17 December 1969 termination, the 12,618 total Blue Book reports, 701 unidentified cases and the Air Force's stated basis for closure, including the Condon Report and NAS review.
Read the NARA reference page
Air Force Declassification Office — Project Blue Book
Type: Official Air Force historical statement.
Confirms the programme's closure and the Air Force's conclusions after its long UFO investigation.
Read the Air Force fact sheet
1968 House Symposium on Unidentified Flying Objects
Type: Congressional scientific/policy symposium.
Provides contemporary scientific arguments for continued UFO research immediately before completion of the Condon Report. Useful for documenting that technically trained dissent existed outside the Colorado project.
Read the symposium archive
AARO — Historical Record Report, Volume I (2024)
Type: Current Department of Defense institutional history.
Places the Colorado Project and NAS review within the official history of U.S. UAP programmes. Useful modern context, but not a substitute for the original report.
Read the AARO report