This 1950 CIA Information Report from Chile discusses a German scientist's article theorizing that "Flying Discs" could be explained as a new type of aircraft based on aerodynamic principles developed in German research facilities during and after WWI, using rotating cylinders or gas-turbines to create lift through boundary layer manipulation, rather than conventional wings. A redacted version of this report has been available on CIA's public website.

This document is a Central Intelligence Agency (CIA) intelligence information report (IIR) that describes human intelligence gathering activities in the Union of Soviet Socialist Republics (USSR). This report characterizes its content as informational, not as finally evaluated intelligence. In section 14 of this document, the source describes an incident occurring in summer of 1973, where he allegedly observed an airborne, luminous, bright green, unidentified object. The source described concentric circles forming around the phenomenon over a period of several minutes, before it dissipated. The source also stated that no sound attended the observation. The source offered no opinion on the nature of the phenomenon and was unable to provide further details regarding the incident.

This file contains SHAEF messages and memorandums related to "night phenomena (foofighters)," flak rockets, unidentified cylindrical objects, and blinking lights. The documents include multiple references to the observations of the 415th Night Fighter Squadron.

An FBI report from 1957 detailing the interview with Wladyslaw Krasuski, who recounted seeing a large, circular, vertically-rising vehicle in 1944 Germany near a German military compound.