Credit to Reddit user mrrapacz for sharing this e-mail from the National Archive:

“Are you interested in seeing if the truth is out there? Help us transcribe a new UFO-related mission with thousands of records available for transcription. Records include civilian and military eyewitness reports, case files, transcripts, and interviews. Join the mission.”

As part of the National Archives’ staff ongoing declassification and digitization efforts, several more series relating to UFOs were added to the National Archives Catalog. You can explore these digitized records and more:

Roswell Report Source Files, 1987-1996

Case Files on Sightings of Unidentified Flying Objects (UFOs), 1953–1960

Moving Images Relating to “The Roswell Reports” Source Data Research Files

Case Files of the 4602d Air Intelligence Service Squadron on Sighting of Unidentified Flying Objects (UFOs), 1954-1956

Project Bluebook Artifacts, 1952-1969

Project Bluebook Artifacts, 1947-1969

Sanitized Version of Project Blue Book Case Files on Sightings of Unidentified Flying Objects, 1947-1969

Project Blue Book Case Files on Sightings of Unidentified Flying Objects (UFOs), June 1947-December 1969

Project “Blue Book”, 1954-1966

Project Blue Book Administrative Files, 1947-1969

Project Blue Book Motion Picture Films, 1950-1966

Project Blue Book Case Files on Sightings of Unidentified Flying Objects (UFOs), June 1947 - December 1969

Copies of the Case Files of the 4602D Air Intelligence Service Squadron on Sightings of Unidentified Flying Objects (UFOs), 1954-1956