Kevin Day is a retired U.S. Navy Senior Chief Operations Specialist (E-8) with more than 20 years of active service, specializing in operating the SPY-1 Aegis radar system and serving as a TOPGUN-qualified Air Intercept Controller.12 He is best known as the Princeton Combat Information Center operator who first detected and tracked the anomalous aerial contacts during the 2004 USS Nimitz UAP encounter, and who subsequently vectored Commander David Fravor to visually investigate one of those contacts on November 14, 2004.3
Navy Career
Day's active-duty career spanned more than two decades and included sea tours aboard the USS Vincennes (CG-49), USS Chosin (CG-65), and USS Princeton (CG-59).2 His primary specialty was the SPY-1 phased-array radar at the core of the Aegis combat system, and he held qualification as an Air Intercept Controller — the category of specialist trained to vector fighter aircraft onto airborne radar contacts during intercepts.12 AIC qualification from TOPGUN represents the highest recognized proficiency level for that role in the U.S. Navy.
Radar Detections
During routine combat training exercises conducted approximately 100 miles southwest of San Diego in early November 2004, Day began observing clusters of anomalous contacts on the Princeton's SPY-1 radar beginning around November 10.3 The objects appeared at altitudes above 80,000 feet — beyond the operational ceiling of any known aircraft at the time — and descended rapidly into lower-altitude airspace before ascending again.3 Day later estimated that certain descent profiles implied velocities exceeding 20,000 mph based on the radar track data.3 He described watching them on the display as resembling snow falling from the sky.
After ruling out radar system malfunction through standard diagnostic procedures and corroborating observations from other operators, Day brought the contacts to the Princeton's commanding officer and requested authorization to vector aircraft for a visual investigation.3
The November 14 Intercept
On November 14, 2004, Day vectored Commander David Fravor and Lieutenant Commander Jim Slaight — flying F/A-18F Super Hornets from VFA-41 Black Aces off the USS Nimitz — to one of the active contacts.34 Fravor visually acquired a white, roughly 40-foot, Tic-Tac-shaped object maneuvering above a disturbed patch of ocean with no visible wings, rotors, or conventional propulsion surfaces.4 The combination of Day's radar tracks, Fravor's visual account, and the FLIR1 infrared footage subsequently filmed by Lieutenant Chad Underwood constitutes the primary evidentiary record of the encounter.45
The U.S. Navy formally acknowledged on September 17, 2019 that the videos associated with the encounters — including FLIR1 — depicted unidentified aerial phenomena, and the Department of Defense released three declassified Navy videos on April 27, 2020.5 The incident first entered wide public awareness through a December 16, 2017 New York Times article by Helene Cooper, Ralph Blumenthal, and Leslie Kean disclosing the existence of the Pentagon's Advanced Aerospace Threat Identification Program (AATIP).3
Public Account and Personal Consequences
Day gave his first on-camera interview as part of the History Channel series Unidentified: Inside America's UFO Investigation (2019), hosted by former AATIP director Luis Elizondo.1 He has subsequently spoken at conferences including the UFO Congress and the Alternative Propulsion Engineering Conference.26
Day has stated publicly that the experience carried significant personal and professional costs. He reports being ridiculed by colleagues and superiors for reporting the contacts, receiving no formal follow-up investigation by the chain of command, and eventually receiving a diagnosis of complex PTSD connected to the aftermath. He has also described the breakdown of his marriage. Despite these consequences, he has remained consistently vocal in public about the events he observed.3
UAPx and Ongoing Field Research
Following his retirement, Day co-founded UAP eXpeditions — later formalized as UAPx Inc. — alongside fellow Princeton crewmembers Gary Voorhis and Jason Turner.7 The organization deploys multi-sensor arrays (visual and infrared cameras, radiological detectors) at UAP hotspots off the California coast near Catalina Island, the same general region where Day originally tracked the 2004 contacts.78 UAPx has recruited scientists including Dr. Kevin Knuth, a former NASA researcher and University at Albany physics professor, to provide analytical rigor to field data collection.7
Skeptical Challenges
The strongest counterargument to Day's radar claims centers on the nature of the contacts themselves. Some analysts have raised the possibility that the anomalous tracks Day observed may have been synthetic training tracks injected into the Princeton's shared tactical data link by TACTRAGRUPAC (Tactical Training Group, Pacific), which was conducting an exercise involving simulated air contacts during the same period. Under this interpretation, Day was tracking computer-generated training objects rather than physical phenomena.
Day disputes this reading, citing his extensive AIC experience with hundreds of intercepts and the presence of corroborating witnesses in the CIC.3 Separately, analysts have argued that the FLIR1 video may reflect camera gimbal artifacts rather than extraordinary object performance, a critique that applies to the video record but not directly to the radar tracks. The Navy has not publicly released raw SPY-1 radar data from the Princeton, making independent technical verification of Day's reported track data impossible. The 2004 Nimitz encounter remains formally unresolved by the Department of Defense.5