Mount Rainier, Washington UFO Sighting (late July 1948) — AARO Records (D213P14)
A first saucer wave case from Mount Rainier, Washington. Project SIGN staff allegedly drafted a report concluding that UFOs were 'interplanetary' in origin.
Background
On late July 1948, in Mount Rainier, Washington, the All-domain Anomaly Resolution Office (AARO) recorded the unidentified-phenomenon case described below. The case is preserved in AARO’s 2024-2025 publications and consolidated annual reports to Congress, declassified or released in the Office of the Director of National Intelligence and Department of Defense reporting cycles.
One of the first wave of “flying saucer” reports that swept the united states after the kenneth arnold sighting of june 1947 and the roswell incident of july 1947.
The case appears in materials produced or curated by the All-domain Anomaly Resolution Office.
What the document records
Project SIGN staff allegedly drafted a report concluding that UFOs were ‘interplanetary’ in origin. This report was rejected by the USAF Chief of Staff, General Hoyt S. Vandenberg, due to a lack of proof. The rejection may have contributed to a loss of confidence in the Project SIGN staff.
Verbatim from the file
“UFOs were “interplanetary” in origin”
Type of case
The case is a visual sighting reported by ground or air observers.
Status
AARO designates unresolved cases as those for which the agency has not concluded the events were anomalous, has not concluded that they were conventional, and has not ruled out either possibility. Conventional candidates for sightings of recent periods include commercial drones, classified test platforms, satellite re-entry, balloon traffic, atmospheric optical phenomena, and astronomical objects.