PURSUE Record — Tehran F-4 incident — Iran (September 19, 1976): Imperial Iranian Air Force / U.S. DIA · Tehran, Iran · September 19, 1976

The Tehran F-4 Incident record in PURSUE Release 01 is a declassified U.S. Defense Intelligence Agency cable from October 1976, documenting an encounter that unfolded over Tehran, Iran in the early hours of September 19, 1976. The record originates from the Imperial Iranian Air Force's operational response that night and was subsequently assessed and transmitted by the DIA to U.S. recipients. It is now part of the May 8, 2026 Department of War release catalogued on the SkyLens UAP files page.

What this record contains

The record is classified as type HIST — an official historical document — released by the Imperial Iranian Air Force in conjunction with the U.S. Defense Intelligence Agency, which authored the cable. The incident location is Tehran, Iran; the incident date is September 19, 1976; and the full release consists of a single file part. The original DIA cable is the primary artifact here, not raw sensor footage or imagery.

According to the official description, Iranian Imperial Air Force ground control began directing two F-4 Phantom interceptors toward a bright unidentified object at 12:30 AM, after multiple civilian callers reported it over the city. Both aircraft reportedly experienced instrumentation failures — specifically to weapons control systems and communications — when they closed on the object. The first F-4 broke off and returned to base. The second crew reported a smaller bright object emitting from the primary and descending toward the ground, and also reported instrumentation failure during a weapons-lock attempt. The DIA's own assessment of the case, made contemporaneously in October 1976, described it as a "classic case" and assigned it the agency's highest interest rating.

Sensor & operational context

This record is not a sensor video or photographic capture — it is an intelligence cable produced within the U.S. defense establishment during a period when the DIA was actively collecting and assessing foreign military UAP reports. In 1976, Iran under the Shah was a close U.S. intelligence and military partner; the Imperial Iranian Air Force operated U.S.-supplied F-4 Phantom II aircraft. A DIA cable originating from an allied air force's encounter would travel through established intelligence-sharing channels, which is precisely what this record represents. The "highest interest" rating the DIA assigned reflects the agency's own analytical judgment at the time, not a modern reassessment.

The reported instrumentation anomalies — weapons control dropout and communications interference during closure on the object — are the operationally significant details documented in the cable. The public release does not include raw telemetry, cockpit recordings, or ground radar data beyond what is summarized in the DIA assessment itself. Evaluating those reported anomalies technically depends entirely on the DIA's contemporaneous account, which is the document now released.

What this does and does not prove

What the record documents is this: an official U.S. government intelligence cable, produced in October 1976, stating that two Iranian military pilots reported instrumentation failures during an intercept attempt and that the DIA considered the case significant enough to assign its highest interest classification. What the record does not establish is the cause of those reported failures, the nature or origin of the observed object, or whether the DIA's "classic case" characterization reflects a judgment about the object's nature versus its evidentiary quality as an encounter report. "Unresolved" in the context of PURSUE Release 01 means the case was not explained to the releasing agency's satisfaction — it does not constitute confirmation of any specific hypothesis. The DIA cable is evidence that senior U.S. intelligence officials in 1976 took the report seriously. It is not, by itself, evidence of what the object was.

How it fits PURSUE Release 01

The Tehran F-4 record sits within the historic document strand of the May 8, 2026 release, alongside FBI archival files dating to 1947 and other legacy government records that the Department of War coordinated through AARO for public disclosure. Its inclusion demonstrates the release's stated analytical discipline: U.S. government recognition of a foreign-government UAP case with a documented chain of institutional custody, made available to the public as part of the broader 162-document package. For context on comparable cases in this release, other PURSUE coverage on this blog examines how different record types — from DoW mission reports to NASA archive imagery — fit within the release's overall scope.

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.