Air Intelligence Information Report, Guam, December 31, 1956 — Department of War File
This AIIR records a December 31, 1956, incident in the vicinity of Guam in which the pilot of a U.S. Air Force F-86D aircraft reported observing an unidentified aerial blinking light. The report notes that a lighted weather balloon had been launched before the sighting and states that, if the…
Incident Overview
On December 31, 1956, in Guam, the Department of War preserved a documentary record that was declassified and published on October 23, 2026 as part of the seventh tranche of the Department of War’s Presidential Unsealing and Reporting System for UAP Encounters (PURSUE).
What the government released
This document is an Air Intelligence Information Report (AIIR), a standardized U.S. Air Force reporting form used to record raw information of potential intelligence value for later analysis. The form served as a primary vehicle for U.S. Air Force field intelligence collection throughout the early Cold War, until defense-wide reporting standards were established in the early 1960s.
This AIIR records a December 31, 1956, incident in the vicinity of Guam in which the pilot of a U.S. Air Force F-86D aircraft reported observing an unidentified aerial blinking light. The report notes that a lighted weather balloon had been launched before the sighting and states that, if the balloon had malfunctioned and remained at a relatively low altitude, it could possibly explain the reported object. It also indicates that the preparing officer did not regard the balloon explanation as sufficient unless that condition applied.
All descriptive and estimative language contained in this report reflects the reporter’s subjective interpretation at the time of the event. Such characterizations should not be interpreted as a conclusive indication of the presence or absence of any intrinsic object features or performance characteristics.
Status of the case
This is an archival record, and it should be read as one. It records what a particular office believed, or was willing to commit to paper, on the day it was written — not a present-day finding. The mid-century investigations worked from witness testimony, sparse instrumentation, and the strategic anxieties of the early Cold War, and the great majority of the sightings they catalogued were eventually attributed to aircraft, balloons, astronomical objects, and misidentification. The All-domain Anomaly Resolution Office has made no modern determination about the incidents described here, and the record’s release is not an endorsement of the conclusions inside it. Its value is as evidence of how the United States government investigated the question, and of what it chose to keep.