PURSUE Record — Coyne helicopter incident — Ohio (October 18, 1973): U.S. Army Reserve / 316th Medical Detachment · Near Mansfield, Ohio · October 18, 1973

The Coyne helicopter incident — Ohio (October 18, 1973) is a declassified historical record (type: HIST) originating from the U.S. Army Reserve's 316th Medical Detachment and released as part of PURSUE Release 01 on May 8, 2026 by the U.S. Department of War. The record documents a close aerial encounter reported by a four-person Army Reserve crew during a routine flight over central Ohio — a case that entered the permanent official record through both a formal Army Reserve incident report and a subsequent investigation conducted by the American Institute of Aeronautics and Astronautics (AIAA).

What this record contains

This single-part file covers an incident that took place on the night of October 18, 1973, near Mansfield, Ohio. The crew — piloted by Captain Lawrence Coyne — was en route from Columbus to Cleveland aboard a Bell UH-1H Huey helicopter when they reported a rapidly closing red light on the southeast horizon. According to the official description, as the object approached, the helicopter began descending even though the collective was set for climb, and the magnetic compass spun continuously. The object passed directly overhead and, per the crew's account in the Army Reserve incident report, emitted a green beam from its underside that pivoted forward and bathed the cockpit. Altitude telemetry embedded in the report showed the aircraft at 1,700 feet at the start of the encounter and at 3,500 feet by its end — a gain of approximately 1,800 feet — while the collective remained set for descent throughout.

The public release does not include additional file parts beyond this single document. The AIAA investigation referenced in the metadata represents a rare instance of an aeronautics professional body formally engaging with a military UAP incident report, lending the case a layer of technical scrutiny that most contemporaneous records lack.

Sensor & operational context

The 1973 encounter occurred in a specific institutional moment. The Condon Committee's report — which effectively ended the Air Force's Project Blue Book in 1969 — had formally transferred UAP case work away from dedicated military investigation units. By the early 1970s, incidents were being logged through standard military reporting channels, such as the Army Reserve's own incident report system, rather than through any centralized UAP office. The 316th Medical Detachment crew were trained military personnel conducting a routine administrative flight, not a research or surveillance mission; their report therefore reflects operational military documentation standards rather than purpose-built sensor instrumentation.

The altitude discrepancy — the aircraft climbing roughly 1,800 feet with the collective set for descent — is a flight-parameter datum recorded in the incident report itself and represents the kind of verifiable, instrument-logged detail that distinguished this case from pure eyewitness testimony. The compass anomaly, likewise, was a crew-reported instrument behavior. Neither data point has an independently verified technical explanation in the public record.

What this does and does not prove

What is documented: four Army Reserve crew members filed an official incident report describing a close aerial encounter; the AIAA conducted a follow-on investigation and found the case unresolved; altitude figures recorded in the report show an unexplained altitude gain during the encounter period. What is not established: the nature, origin, or physical characteristics of whatever the crew observed. The green light, the red-light approach, and the instrument anomalies are crew-reported observations, not independent sensor captures. "Unresolved" in the PURSUE Release 01 framework means the incident has not been satisfactorily explained — it does not constitute confirmation of any particular hypothesis, extraterrestrial or otherwise. Instrument malfunctions, atmospheric optics, and misidentified conventional aircraft remain within the space of unconsidered explanations in the public record.

How it fits PURSUE Release 01

Within the broader PURSUE Release 01 catalogue — 162 documents spanning FBI archive materials dating to 1947, Department of War contemporary mission reports, and NASA archive imagery — the Coyne record sits in the historical military-incident-report tier alongside other HIST-type files drawn from service branch documentation systems. It is notable as one of the few cases in the release where a non-governmental technical body (the AIAA) formally reviewed the underlying report, giving it a dual-provenance that most historical military UAP records lack. Readers interested in how this case compares to other military encounters in the release can browse the full set on the UAP files page.

Editorial note: This analysis is independent commentary on a publicly released document. The original record, source links, and full release metadata are catalogued on the SkyLens UAP files page alongside every other case in the PURSUE Release 01 set.