Harmon Field, Guam UFO Sighting (August 14, 1947) — FBI Files
On August 14, 1947, personnel at Harmon Field, Guam, reported observing two crescent-shaped objects moving in a high-speed zig-zag pattern.
Historical Context
The sighting at Harmon Field occurred during a pivotal period in the history of unidentified aerial phenomena. The summer of 1947 is widely recognized by historians of the phenomenon as the beginning of the first modern wave of “flying saucer” reports. This era was catalyzed by the Kenneth Arnold sighting in June 1947 and the subsequent, highly debated events surrounding the Roswell incident in July 1947. During this time, the rapid advancement of aeronautical technology following World War II created a landscape where the distinction between conventional military hardware and unidentified objects was often blurred for observers.
The geographic location of the incident, Harmon Field on the island of Guam, placed the event within a critical strategic zone for the United States military. As a key outpost in the Pacific, Guam hosted vital installations that required constant surveillance and protection. During the late 1940s, the United States was transitioning into the early stages of the Cold War, a period characterized by heightened sensitivity regarding airspace integrity and the potential for unauthorized incursions by foreign powers.
The Incident
On August 14, 1947, personnel stationed at Harmon Field, Guam, observed an unidentified-object incident that was subsequently recorded by U.S. government investigators. The documentation, which was released to the public on May 8, 2026, as part of the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE), describes the visual characteristics of the objects in detail. According to the records, personnel observed two crescent-shaped objects traveling at high speeds. These objects moved in a distinct zig-zag pattern before disappearing into the cloud cover. Following this disappearance, a third object, described as being similar in nature to the first two, emerged from the clouds and continued a westward trajectory.
The official file contains a verbatim description of the event, noting the presence of two objects which were described as small, crescent-shaped, and traveling at a speed twice that of a fighter plane, passing over the observers on a four-part zig-zag course. While the document provides specific details regarding the flight path and velocity of the objects, the total number of witnesses to the event is not specified within the released text.
Investigation and Classification
The reporting of this incident followed established federal protocols of the era. The case was filed with the Federal Bureau of Investigation (FBI). At the time, the Bureau’s various field offices, including those in Knoxville, Albuquerque, and Los Angeles, were tasked with routing UFO reports to headquarters under standing protocols designed for the protection of vital installations. This administrative structure ensured that any aerial phenomenon observed near sensitive military or government sites was centralized for analysis by federal authorities.
The nature of this case is classified as a visual sighting reported by ground or air observers. As with all records released under the PURSUE program, the All-domain Anomaly Resolution Office (AARO) designates the event as unresolved by default. The federal government has maintained a position of neutrality regarding the Harmon Field sighting, neither concluding that the objects were anomalous nor confirming that they were conventional.
In the context of 1947, several conventional explanations are often considered by researchers when analyzing such reports. These include the presence of experimental aircraft, the observation of weather balloons—specifically those associated with the Project Mogul series active in the late 1940s—or atmospheric optical phenomena such as sundogs and lenticular clouds. Additionally, astronomical objects like the Moon, Venus, or meteors near the horizon are frequently cited as potential candidates for unidentified sightings during this period of high-frequency reporting.