The NSA page titled "Unidentified Flying Objects (UFOs) and Paranormal Events" is an official FOIA Frequently Requested Information collection for declassified historical PDF records, and NSA warns that many files are scanned images of formerly classified carbon-paper documents.1
The resource matters because it centralizes document-backed research in one government index: NSA's FOIA Reports and Releases list groups a UFO collection with records ranging from extraterrestrial-communications material to Air Force, State Department, DIA, GAO, and court documents.23456
Read the collection as a release portal, not an evidentiary verdict. The linked Air Force Project Blue Book fact sheet says the Air Force investigated UFOs from 1947 to 1969, ended Project Blue Book on Dec. 17, 1969, recorded 12,618 sightings with 701 still unidentified, and found no evidence that unidentified sightings were extraterrestrial vehicles.4
Roswell researchers get two near-primary anchors in the same NSA-linked set. The Air Force's 1994 report says its review found no records of alien bodies or extraterrestrial materials and identified the recovered debris as consistent with Project Mogul balloon material, while GAO's 1995 report describes a broader search across DoD, FBI, CIA, and National Security Council records.56
The NSA-specific value is provenance and research discipline. The collection links the Citizens Against UFO Secrecy FOIA order against NSA, the "UFO's and the Intelligence Community Blind Spot to Surprise or Deceptive Data" release, and "UFO Hypothesis and Survival Questions," while the companion no-records page lists requested UFO and paranormal search terms for which NSA says no responsive material was located.78910