What did the declassified documents reveal?

Cold Open. This episode presents a declassified memorandum titled “1948 08 6387298 Maplewood Ohio 169,” issued by the Headquarters Air Materiel Command at Wright‑Patterson Air Force Base, Dayton, Ohio. The document is notable for its early investigation of unidentified aerial phenomena reported in the post‑war period, and it appears in the public archive of The Black Vault. Provenance. The memorandum was released to the public through The Black Vault’s digital collection, reference number 1948‑08‑6387298‑Maplewood‑Ohio‑169. The entry was uploaded on the archive’s website with no specific release date noted, and the declassification authority is listed as the United States Air Force under its standard historical records policy. The full text is available at https://archive.org/download/1948-08-6387298-Maplewood-Ohio-169-/1948-08-6387298-Maplewood-Ohio-169-djvu.txt. The Document. Anermoyanr F TION Arose from beh: seemed to unravel a silver substance that floated earthward. BuO. W proeesst Ast Ind 2h Jan 1919 » A‑T‑R Weather Service Andrews Air Force Base, Washington, D. C. C. Commanding General, Air Materiel Command, Wright‑Patterson Air Force Base, Dayton, Ohio ATTR: RCIAXO erson investigations by this headquarters reveal that a syn weather balloon could have been at the location where the sighting was reported in the following incidents. In compiling this dint consideration was given to the wind direction and the surface and aloft at the scheduled time of the location of the nearest weather stations, speed at balloon release, and tion making balloon obser- 126 U8 155 166 169 172 Jaf We A. Host W. A, WEST Lt. Col., U‑S A‑F Adjutant General HEADQUARTERS AIR MATERIEL COMMAND Wright‑Patterson Air Force Base Dayton, Ohio SUBJECT; Project “SIGn TO: “Chief, Air Weather Service, Andrews Air Force Base, Washington, D. C. ATTN: ss 1. Project “SIGK” is responsible for the investigation and interpretation of data relative to the sighting of unidentified flying objects. Attached Incident Summaries 1 thru 172 from the files of Project “SIGN” are forwarded for study and recommendations as to which of the incidents may be eliminated as balloons released on routine synoptic ascents by this Air Weather Service, the Navy Aerological Services or the United States Weather Bureau. The summary attached may be contained in your headquarters for working and reference purposes. ¢ 2. The Air Weather Service is the only agency of its type that has been asked to assist in the accomplishment of Project “SIGN” except that the United States Weather Bureau has provided information on ball lightning. Research projects in which balloons are used and which are sponsored by the Army, Navy or United States Air Force are checked by the Intelligence Department of this Command. These checks are usually made direct from the Project “SIGN” offices, M‑C IAKO‑3. Those checks are delineated from the checklist of synoptic balloon flights made by weather service stations of the Air Force…

Why was this case declassified?

This material was released by the Central Intelligence Agency (CIA) through the U.S. declassification and Freedom of Information Act (FOIA) process. The originating source document is linked on this page so the citation chain is auditable.

Declassified CIA File

◆ BLUF — The short version

Cold Open. This episode presents a declassified memorandum titled “1948 08 6387298 Maplewood Ohio 169,” issued by the Headquarters Air Materiel Command at Wright‑Patterson Air Force Base, Dayton, Ohio. The document is notable for its early investigation of unidentified aerial phenomena reported in the post‑war period, and it appears in the public archive of The Black Vault.

Agency: Central Intelligence Agency (CIA)
Date: JUL 18 · 2026
Release: Declassified · U.S. public record (FOIA)
Source document: View the primary source document

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What was Declassified CIA File about?: Cold Open. This episode presents a declassified memorandum titled “1948 08 6387298 Maplewood Ohio 169,” issued by the Headquarters Air Materiel Command at Wright‑Patterson Air Force Base, Dayton, Ohio. The document is notable for its early investigation of unidentified aerial phenomena reported in the post‑war period, and it appears in the public archive of The Black Vault.
Why was this case declassified?: This material was released by the Central Intelligence Agency (CIA) through the U.S. declassification and Freedom of Information Act (FOIA) process. The originating source document is linked in the case notes above so the citation chain is fully auditable.

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