Defense authorities admitted they didn't know about UFO sightings over nuclear sites, which one expert called "terrifying."
DoD made the revelation during Tuesday's congressional hearing on UAPs.
In 1967, 10 nuclear warheads were disarmed in Montana after airmen witnessed a UFO.
Officials at the Pentagon denied knowing about the Malmstrom event.
Deputy Director of Naval Intelligence Scott Bray (L) and Under Secretary of Defense for Intelligence and Security Ronald Moultrie questioned Tuesday.
Members of Congress grilled defence experts on UFO sightings and origins, leading them to admit over 400 sightings and 11 near-collisions.
Alejandro Rojas, a UFO researcher from the Scientific Coalition for UAP investigations, said a lack of historical understanding about nuclear bases was "worrying."
Rojas stated the historic briefing confirmed the Pentagon has no crashed UFO or related documents.
The two-hour session in Washington, DC, left many questions unresolved.
US Air Force military person Robert Salas was the airbase captain during the Malmstrom incident.
Griffith Park fire threatens mansions
Click the link below