Incident Report #363 — Sighting near Guam, 8 June 1949

On June 8, 1949, at 1109Z, two crew members aboard an RB-29 aircraft operating out of North Guam Air Force Base observed an unidentified aerial phenomenon. The witnesses, identified as a weather observer and an engineer from the 514th Reconnaissance Squadron, reported seeing a white, billowing substance moving on a straight course from the East-North-East to the West-South-West. The observation lasted for approximately one minute. The altitude of the object was estimated to be between 30,000 and 35,000 feet. The speed was initially estimated at 1400 mph by the observers, though subsequent calculations based on triangulation suggested a speed of 4200 mph. The object was noted to dissipate almost immediately after it was formed. Weather conditions at the time were described as excellent, with a three-quarter moon providing good visibility. No photographs or sketches were produced, and there was no physical evidence or radar contact associated with the event. The official conclusion reached by the reporting authorities was that the phenomenon was likely a meteor trail or a traveling contrail. The report was processed through the 514th Reconnaissance Squadron and forwarded to the Air Materiel Command and other relevant military units under the reference number C-2039. The document was later downgraded and declassified in accordance with DOD Directive 5200.10.