CIA's First UFO Document: OSI Memo from Dr. Stone to Dr. Machle
The earliest known UFO-related document in CIA files was recorded on March 15, 1949: an OSI memo from Dr. Stone to Dr. Machle, responding skeptically to data arguing for the credence of flying saucer reports.
Background
The earliest known UFO-related document in CIA files was recorded on March 15, 1949, in an Office of Scientific Intelligence (OSI) memo from a Dr. Stone to a Dr. Machle (branch office name redacted). Stone responded skeptically to earlier data submitted to him by Machle, which had apparently argued for the credence of flying saucer reports.
This document marks the official beginning of the CIA's engagement with the UFO subject. The OSI — established in 1949 to guard against technological surprise — would become the Agency's primary office for UFO-related matters for the next two decades.
Significance
The earliest known CIA document on UFOs, marking the beginning of 50+ years of Agency involvement.