This 245-page historical file assembles 1947-1948 Air Force correspondence, sighting reports, investigative requests, policy memoranda, and analytical papers associated with flying-disc inquiries and Project SIGN. It documents how Air Materiel Command gathered reports, coordinated intelligence collection, evaluated possible explanations, and considered the problem unresolved despite identifying some reports as balloons or astronomical objects.

Blackgrove Global Risk maps the federal registrations, award histories and policy positions of organizations and former UAP program officials involved in the disclosure debate. The August 2026 issue brief compares claimant-owned firms with established contractors, distinguishes documented records from inference, and tracks the records and witness channels shaping potential federal procurement.

Air Force records trace the 1966 review of Project Blue Book, the decision to seek an independent scientific study, and appended Robertson Panel findings on weak case data, misidentification, radar interference, and public-education concerns. The collection connects multiple stages of federal UFO review and shows how methodological weakness, institutional credibility, and air-defense reporting concerns shaped policy as much as individual cases did.

A 220-page Project Blue Book correspondence file documents public requests, interagency routing, overseas reports, standardized sighting collection, program statistics, and at least one reported object later identified as an upper-air sounding device. The collection reveals the administrative infrastructure behind Project Blue Book and shows why a case file can mix useful program records, resolved incidents, public speculation, and unresolved reports.