DEFE 31: Defence Intelligence Staff UFO Files

These 434 pages span four files from the Defence Intelligence Staff's handling of UFO reports between 1996 and 1999. The collection includes structured sighting report forms (AF Form 413) filed by witnesses and police, DI55 intelligence assessments, and the working papers behind Project Condign, a classified study completed in 2000 by a single DIS analyst. Condign reviewed decades of UK UFO data and concluded that the phenomena were real but attributable to exotic atmospheric plasmas, a hypothesis that remains unverified. The working papers here show the source data, analytical methodology, and policy recommendations that shaped the MOD's final position on the subject before it closed its UFO desk in 2009.