Unidentified Anomalous Phenomena

Unidentified Anomalous Phenomena (UAP) is a classification term adopted by the United States government to describe observed objects or events in air, water, or space that cannot be attributed to known technology or natural phenomena. The terminology emerged from within official investigative circles as a deliberate reframing: Jay Stratton is credited with coining the phrase “unidentified aerial phenomena” as a replacement for the colloquial “UFO,” with the intention of making the subject more tractable for institutional discussion.¹ Programmes such as the Advanced Aerospace Weapon System Applications Program (AAWSAP) were explicitly described by their leaders as focused on investigating unidentified aircraft displaying beyond-next-generation technology — what would later be called UAP.² The United States government has funded and supported UAP investigations since 1945, with the stated goals of determining whether such phenomena represent a flight safety risk, technological advances by competitor nations, or evidence of off-world technology under intelligent control.³

The history of formal UAP investigation in the United States has been marked by discontinuity. A gap of approximately 40 years separated the termination of Project Blue Book in 1969 and the standup of AAWSAP and the Advanced Aerospace Threat Identification Program (AATIP) in 2009.⁴ Resources and staffing for government UAP investigation programmes have been characterised as largely irregular and sporadic, which the All-Domain Anomaly Resolution Office (AARO) assessed as having challenged investigatory efforts and hindered effective knowledge transfer across agencies.⁵ The institutional climate surrounding the topic was substantially hostile for much of the post-war period. According to Christopher K. Mellon, this hostility was a direct result of policies formulated by the CIA’s Robertson Panel in 1953.¹⁰ By 1970, the US Air Force had taken the formal position that UAP reports were simply the result of mild hysteria, hoaxers, psychopathological persons, and misidentification of natural objects.¹¹ As recently as 2017, most commercial and military personnel reportedly feared reporting UAP observations for fear of damaging their careers and reputations.¹²

The AARO, established as the primary contemporary body for UAP investigation within the Department of Defense (DoD), has published assessments concluding that the majority of UAP sightings reviewed were the result of misidentification of ordinary objects and phenomena.⁶ AARO found no evidence from any USG investigation, academic-sponsored research, or official review panel confirming that any UAP sighting represented extraterrestrial technology.⁷ The office assessed that some portion of UAP sightings since the 1940s represented misidentification of experimental and operational space, rocket, and air systems, including stealth technologies and the proliferation of drone platforms.⁸ AARO further noted that such misidentification persists into the present day, with rocket exhaust plumes, micro-satellite trains, and unmanned aerial systems with unusual morphologies among the categories of technology reported as UAP.⁹ No empirical evidence was found by AARO of any UAP sighting representing off-world technology, and all official foreign UAP investigatory efforts were assessed as having reached similar general conclusions.^19,20

Notwithstanding the AARO assessments, a number of senior officials and former intelligence community members have made public statements asserting that UAP represent a more significant and unresolved phenomenon. John Ratcliffe, former Director of National Intelligence, stated that there are substantially more UAP sightings than have been made public, including objects observed by Navy and US Air Force pilots and captured by satellite imagery that engage in actions difficult to explain.¹³ Luis Elizondo, former head of AATIP at the Pentagon, testified before a House subcommittee in November 2024 that UAP are real.¹⁶ In his 2017 resignation letter, Elizondo stated that his investigation had found an apparent direct correlation between UAP and US nuclear and military capabilities.¹⁸ By the time the foreword to Elizondo’s book was written, over one thousand UAP military reports had been filed since 2004.¹⁴

The subject of UAP has attracted increasing legislative attention. The AARO published its Historical Record Report, Volume I, in 2024-02, in fulfilment of a statutory requirement under the FY2023 National Defence Authorisation Act.¹⁵ Elizondo and Mellon worked to channel credible military and intelligence community members with UAP knowledge to Congress, with military pilots described as having the most significant impact on legislative engagement. In his November 2024 House testimony during the Elizondo House UAP Testimony, Elizondo proposed a national UAP strategy that would promote transparency, restore public trust, and encompass a whole-of-government approach including the academic and scientific communities, the private sector, and international partners.¹⁷ Figures including Leslie Kean, Tom DeLonge via the To the Stars Academy of Arts and Science, and Harold E. Puthoff have also played roles in bringing public and institutional attention to the topic. The question of whether UAP represent misidentified conventional phenomena, adversarial technology, or something otherwise unaccounted for remains the central and unresolved issue in the field.