MoD
Ministry of Defence UFO Desk
Ministry of Defence
The UK Ministry of Defence ran a continuous UFO investigation desk from 1950 to 2009. After the desk closed, the MoD released roughly 60,000 pages of files to the National Archives in batches between 2008 and 2017, making it one of the largest single-state UFO disclosures on record.
About the program
The MoD's UFO work originated with the Flying Saucer Working Party, a 1950 Defence Scientific Intelligence committee chaired by Sir Henry Tizard, which produced a confidential report concluding the phenomenon required no further investigation. The desk that became known as DI55 (later DI(ST)) and finally Sec(AS)2a continued to handle public reports for the next six decades, primarily as a national-security filtering function rather than a research program.
The UFO desk was officially closed on 1 December 2009. The MoD's stated rationale was that no UFO report had ever been judged a threat to UK air defence and that the resources were better spent elsewhere.
The post-closure release programme was managed in cooperation with The National Archives at Kew. Files were declassified in tranches between May 2008 and June 2017, ultimately covering the period 1978-2009 in detail and including the famous Rendlesham Forest file, the 1980 Cosford incident, and the 1996 Defence Intelligence Staff 'Condign' report on UAP scientifically and technically.
Landmark documents
Direct primary-source links. Where a backup mirror exists for a known link-rot risk, we name the host.
- Case collection · Released 2008-2017
MoD UFO files release programme (≈60,000 pages, 1978-2009)
Complete declassified MoD UFO desk archive — public reports, internal correspondence, military incident logs, and policy memos. Released in tranches by The National Archives at Kew. Free download.
- Investigation report · Compiled 1996-2000, declassified May 2006
Unidentified Aerial Phenomena in the UK Air Defence Region (Project Condign)
Defence Intelligence Staff scientific study of UAP and their potential explanations, including the controversial 'plasma' hypothesis. Released under FOI in 2006. Often cited as the UK equivalent of a Project Blue Book final report. Held under TNA reference DEFE 24/3155.
Mirror: The Black Vault
- Case file · December 1980 incident; file released 2001
Rendlesham Forest incident file (DEFE 24/1948)
Original MoD case file on the December 1980 Rendlesham Forest incident at RAF Bentwaters/Woodbridge — including Lt Col Charles Halt's memo to the MoD. The single most-requested file in the National Archives UFO record.
Have a primary-source document or release we've missed? The catalog is curated and versioned in the public repository — see About for how to send corrections.