At that time, they said analysts lacked any evidence suggesting any of the sightings were of alien spacecraft, but most of the UAP reports remained unresolved.
Among those were video released by the Pentagon of enigmatic airborne objects observed by Navy pilots exhibiting speed and maneuverability exceeding known aviation technology and lacking any visible means of propulsion or flight control surfaces.
"In many cases, observed phenomena are classified as 'unidentified' simply because sensors were not able to collect enough information to make a positive attribution," Gough said. "We are working to mitigate these shortfalls for the future and to ensure we have sufficient data for our analysis."
The forthcoming release of the latest Pentagon assessment comes after a first-of-its-kind panel organized by NASA opened a separate, parallel study on Oct. 24 of unclassified UFO sightings data from civilian government and commercial sectors.