Presentation by Captain Edward J. Ruppelt, 1952

This audio file records a March 1952 presentation by Captain Edward J. Ruppelt, outlining the U.S. Air Force’s reorganized investigation into unidentified flying objects (UFOs). The presentation previews prospective technical methodologies, such as diffraction-grating photography and radar-scope synchronization, that were subsequently incorporated into Project Blue Book, a U.S. Air Force program active from 1952 to 1969 that investigated the nature and origin of UFOs. Ruppelt explains that out of approximately 800 historical cases reviewed by the Air Force, approximately 20% remained unexplained after technical analysis. These unresolved reports were sourced from credible military…

Catalogue description by the publishing agency.

Record

DOW-UAP-PR160

Release

Release 06 · Sep 18, 2026

Incident

1952-03-26 · Boston, Massachusetts

Type

Audio

Verdict

not judged yet

Source

dvidshub.net ↗