# Report on the Historical Record of U.S. Government Involvement with Unidentified Anomalous Phenomena/Volume 1/Section 1

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​SECTION I: Introduction
This report represents Volume I of the All-domain Anomaly Resolution Office's (AARO) Historical Record Report (HR2) which reviews the record of the United States Government (USG) pertaining to unidentified anomalous phenomena (UAP). In completing this report, AARO reviewed all official USG investigatory efforts since 1945, researched classified and unclassified archives, conducted approximately 30 interviews, and partnered with Intelligence Community (IC) and Department of Defense (DoD) officials responsible for controlled and special access program oversight, respectively. AARO will publish Volume II in accordance with the date established in Section 6802 of the National Defense Authorization Act for Fiscal Year 2023 (FY23); Volume II will provide analysis of information acquired by AARO after the date of the publication of Volume I.
Since 1945, the USG has funded and supported UAP investigations with the goal of determining whether UAP represented a flight safety risk, technological leaps by competitor nations, or evidence of off-world technology under intelligent control. These investigations were managed and implemented by a range of experts, scientists, academics, military, and intelligence officials under differing leaders—all of whom held their own perspectives that led them to particular conclusions on the origins of UAP. However, they all had in common the belief that UAP represented an unknown and, therefore, theoretically posed a potential threat of an indeterminate nature.
AARO's mission is similar to that of these earlier organizations. AARO methodology applies both the scientific method and intelligence analysis tradecraft to identify and help mitigate risks UAP may pose to domain safety and to discover, characterize, and attribute potential competitor technological systems. A consistent theme in popular culture involves a particularly persistent narrative that the USG—or a secretive organization within it—recovered several off-world spacecraft and extraterrestrial biological remains, that it operates a program or programs to reverse engineer the recovered technology, and that it has conspired since the 1940s to keep this effort hidden from the United States Congress and the American public.
AARO recognizes that many people sincerely hold versions of these beliefs which are based on their perception of past experiences, the experiences of others whom they trust, or media and online outlets they believe to be sources of credible and verifiable information. The proliferation of television programs, books, movies, and the vast amount of internet and social media content centered on UAP-related topics most likely has influenced the public conversation on this topic, and reinforced these beliefs within some sections of the population.
The goal of this report is not to prove or disprove any particular belief set, but rather to use a rigorous analytic and scientific approach to investigate past USG-sponsored UAP investigation efforts and the claims made by interviewees that the USG and various contractors have recovered and are hiding off-world technology and biological material. AARO has approached this project with the widest possible aperture, thoroughly investigating these ​assertions and claims without any particular pre-conceived conclusion or hypothesis. AARO is committed to reaching conclusions based on empirical evidence.
Lastly, AARO thanks all participants in this review who made this report possible, to include the interviewees who came forward with information.