DOW-UAP-D096 — Correspondence Relating to Project Blue Book, 1955
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.
- File
- Document · Release 04
- Date
- 1955
- Location
- Various
- Extent
- 220 pages
Search This File
Probed Assessment
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.
Key takeaways
- The correspondence shows Blue Book functioning as an information and routing system for students, publishers, civilian researchers, military offices, and overseas attachés.
- A reported falling object at Sardis Lake moved through intelligence channels before Air Weather Service identified it as atmospheric-sounding equipment, illustrating how investigation could produce a conventional resolution.
- The fiscal-year summary described faster field investigation and broad explanation categories while retaining some insufficient-data and unknown cases.
- Personal reports and speculative letters in the file document what correspondents claimed; their inclusion is not Air Force validation of those claims.
Why it matters
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.
Corroboration
The documents directly corroborate correspondence, routing actions, forms, and official program statements. Individual civilian accounts remain unverified unless the file records a separate investigative result.
Open questions
- • How many reports in this correspondence set can be linked to complete Blue Book case files?
- • What effect did faster on-site investigation have on final case classifications beyond the program’s own summary?
Probed separates this editorial assessment from the source claims below. It summarizes what the released artifact supports; it is not independent verification.
Official Description from War.gov
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.
Preserved verbatim as source metadata. This wording is separate from Probed’s file-specific description and assessment.
File Context
Related entities
Tracker findings
Air Weather Service identified one recovered object as an upper-air instrument
A February 1955 endorsement identifies the object discussed in the underlying letter as an atmospheric-detection device used for upper-air soundings. It asks that the instrument be returned to the Air Force's Radiosonde Rehabilitation facility.
Release provenance
- Release
- Release 04
- Official ID
- release-04-file-020-dow-uap-d096-correspondence-relating-to-project-blue-book-1955
- Cleared
- Jul 10, 2026
Referenced Timeline
Project Blue Book fiscal-year activity summarized
The program compiled report categories and described changes in insufficient-data and unknown classifications.
LinkedProject Blue BookSardis Lake object referred
Army and Air Force offices routed a reported falling object for technical identification.
Air Weather Service identified sounding device
The Sardis Lake object was identified as an upper-air atmospheric-detection device.
Civilian and publishing requests processed
Project Blue Book and Air Technical Intelligence Center handled requests from researchers and organizations.
Indonesian correspondence routed
A Bandung letter was sent to the U.S. air attaché in Jakarta for action.
Source Claims
Claims are attributed to the released source and remain distinct from Probed’s assessment and tracker findings.
The Air Technical Intelligence Center forwarded replies and information about unidentified flying objects through Air Force intelligence policy channels.
AIR TECHNICAL INTELLIGENCE CENTER
A high-school student wrote Project Blue Book seeking material for a public-speaking assignment, illustrating the volume of educational and public requests handled by the program.
U.S. Air Force Project Bluebook
Another student letter asked the Secretary of the Air Force about secrecy, war, and public disclosure, reflecting public speculation rather than an official finding.
I have become extremely interested in flying saucers
A City College writer requested Air Force information for articles on interplanetary flight, another example of media and educational correspondence in the file.
engaged by "Main Events"
The Office of Naval Research asked Air Force intelligence for information on unidentified flying objects, documenting interagency interest.
Chief of Naval Research To: Director of Intelligence, U. S. Air Force
Bernard Baruch Jr. acknowledged information about UFO reports sent to U.S. embassy attachés, showing that reporting channels extended overseas.
reports on unidentified flying objects made to attaches at our embassies
The Army Corps of Engineers referred a reported falling object at Sardis Lake through military intelligence channels for evaluation.
Falling Object - Sardis Lake
Air Weather Service identified the Sardis Lake object as an atmospheric-detection device used for upper-air soundings and requested its return for rehabilitation.
an atmospheric detecting device used by the U.S. Air Weather Service in making upper air soundings
A correspondent from Mexicali reported seeing a saucer-like craft near Cerro Prieto at low estimated altitude; the letter is an unverified personal account.
More than two years ago, I personally saw a flying saucer
Project Blue Book’s fiscal-year summary described reports processed through military channels and separated civilian from military submissions.
STATUS AND INFORMATION SUMMARY PROJECT BLUE BOOK FOR THE FISCAL YEAR 1 JULY 1954 - 30 JUNE 1955
The summary credited rapid on-site investigation with reducing insufficient-data and unknown classifications and listed broad categories including balloons, astronomical objects, aircraft, and reflections.
This program provides primarily for rapid "on the spot" UFO investigations
An Air Force reply told a civilian observer that voluntary reports were useful to an active investigation program.
this area and 1ntonat100 such as J'OUr'S submitted on a voluntary basis is extremely helptul. '.ftlia infor-.tian ba.a been turned over to our analyata for tu.rtber evaJ.uatico.. For your convenience, I am attaching a copy o't "U. s. Air Force SUllllll.rY ot Events and Inf'ormation
The National Space Observers League wrote Project Blue Book about a Fate Magazine article titled ‘Are The Saucers Made On Earth?’
U.S. Air Force Intelligence c/o Project Bluebook. … In the August issue of Fate Magazine, there is an article titled ‘Are The Saucers Made On Earth?’
The file includes a standardized sighting form requesting date, time, size, shape, speed, altitude, direction, maneuver, color, sound, duration, weather, visibility, and observer information.
PLEASE SEND TO YOUR NEAREST AIR FORCE BASE
Air Force intelligence routed a letter from Bandung, Indonesia, to the U.S. air attaché in Jakarta for action.
FORCE WASHINGTON as. D. c. ..··"·"';:. b. r : e.7'-- ' l3 Sep'b811bar 1955 AJ'OD-X StJBJ:D:,T: Letter Frc:a T.M. Ormarsaap, Bandung., Indone ■ia TO: tJ. S. Air Attacbe Aaericaa Dlbuay D3alcarta, Indonesia
The translated Indonesian letter concerned a claimed method for manufacturing or developing a flying-saucer concept; it is correspondence, not validation by the Department of Defense.
G2 TRANSLATION NO. G-5144
Source Material & Evidence
Research Map
Lines appear only when two entities share a row-level source claim or dated timeline event. Unconnected nodes remain visible without implying a relationship.