NARA Blue Book: 701 Residual “Unidentified”
Air Force Fact Sheet via NARA: 12,618 sightings (1947–1969); 701 remain Unidentified; project ended 17 Dec 1969.
Sources archives.gov Blue Book overview; NARA UAP textual/microfilm topic pages; catalog.archives.gov series 597821 (sanitized Blue Book case files)
The National Archives hosts the Air Force’s Project Blue Book fact sheet language that still structures public memory of the 1947–1969 investigation: 12,618 sightings processed; 701 left labeled Unidentified; project terminated 17 December 1969. Records live at NARA; there is no open Air Force investigative shop behind the brand name.
Residual is a label
“Unidentified” in Blue Book usage is an Air Force residual category, not a Ledger endorsement of extraterrestrial craft. Batch-6 press recirculation in September 2026 put the framing back in circulation beside PURSUE clips — useful timing for an archival cite file. Status cited.