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This document, released as additional information for Australian Senate Estimates, reproduces the Office of the Director of National Intelligence's Preliminary Assessment on Unidentified Aerial Phenomena, dated 25 June 2021. It was prepared for congressional committees under Senate Report 116-233 and covers mostly US Government reports from November 2004 to March 2021. It finds that limited data hampers firm conclusions and that most UAP are probably physical objects. It proposes five explanatory categories and concludes that UAP pose a flight safety issue and possibly a national security challenge.
UNCLASSIFIED 8 UNCLASSIFIED APPENDIX A - Definition of Key Terms This report and UAPTF databases use the following defining terms: Unidentified Aerial Phenomena (UAP): Airborne objects not immediately identifiable. The acronym UAP represents the broadest category of airborne objects reviewed for analysis. UAP Event: A holistic description of an occurrence during which a pilot or aircrew witnessed (or detected) a UAP. UAP Incident: A specific part of the event. UAP Report: Documentation of a UAP event, to include verified chains of custody and basic information such as the time, date, location, and description of the UAP. UAP reports include Range Fouler1 reports and other reporting. 1 U.S. Navy aviators define a “range fouler” as an activity or object that interrupts pre-planned training or other military activity in a military operating area or restricted airspace.
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