DOW-UAP-D106 is a technical working paper, dated April 10, 1968, that re-evaluates the statistical methods behind Project Blue Book Special Report No. 14. It originated at Wright-Patterson AFB, Ohio, and was declassified and released publicly for the first time as part of PURSUE Release 05 on August 7, 2026. 123
Provenance and Context
The paper comes from the late stages of Project Blue Book, the U.S. Air Force's investigation into unidentified flying objects, headquartered at Wright-Patterson Air Force Base and maintained by the Department of War. It is an internal check on the project's own statistical methods, revisiting conclusions reached in Special Report No. 14.3
Detailed Content / Analysis
The paper re-examines how Special Report No. 14 categorized "unidentifiable" cases and what percentage of sightings remained unexplained after strict observational quality standards were applied. It questions whether the statistical models used in the original report adequately accounted for high-quality reports that resisted conventional explanation, pointing to internal disagreement within the Air Force over the true proportion of anomalous events.3
The document does not resolve the unidentifiable cases it discusses. It records that the question was open within Project Blue Book in 1968, not how it was settled.3