UNCLASSIFIED // PUBLIC RELEASERELEASE 04 · JULY 10, 2026

Correspondence Relating to Project Blue Book, 1955

This file contains correspondence relating to Project Blue Book, a 1952-1969 U.S. Air Force program to investigate the nature and origin of unidentified flying objects (UFO). The correspondence includes letters and memoranda sent between various departments and agencies of the U.S. Government, the Legislative Branch, and private citizens concerning UFO sightings and the research and findings of Project Blue Book.