General Information
The United States Air Force retired to the custody of the National Archives its records on Project BLUE BOOK relating to the investigations of unidentified flying objects. Project BLUE BOOK has been declassified and the records are available for examination in our research room. The project closed in 1969 and we have no information on sightings after that date.
The National Archives has received numerous inquiries concerning documents identified as "MJ12" and "Briefing Document: Operation Majestic 12." We have made extensive searches among the records in our custody of the U.S. Air Force and the Joint Chiefs of Staff to identify these documents. The Truman and Eisenhower Libraries have also searched their holdings for any references to, or copies of, the documents. In addition, the records of the National Security Council (NSC) for the Truman and Eisenhower Administrations are in the custody of the National Archives. Searches were made of the indexes to the NSC's Policy Paper and Meeting Minute files under the subjects MJ-12, majestic, unidentified flying objects, UFO, flying saucers,extraterrestrial biological entities and Aquarius. These searches were all negative with the exception of a "Memorandum for General Twining, from Robert Cutler, Special Assistant to the President, Subject: "NCS/MJ-12 Special Studies Project" dated July 14, 1954. The memorandum, one page, refers to a briefing to take place on July 16. The memorandum does not identify MJ-12 or the purpose of the briefing.
https://www.archives.gov/research/military/air-force/ufos