Haines, Gerald K. "The CIA's Role in the Study of UFOs, 1947-90." Studies in Intelligence (Semiannual ed. 1, 1997): 67-84. Reprinted as "A Die-Hard Issue: CIA's Role in the Study of UFOs, 1947-90." Intelligence and National Security 14, no. 2 (Summer 1999): 26-49.

"The idea that CIA has secretly concealed its research into UFOs has been a major theme of UFO buffs since the modern UFO phenomena emerged in the late 1940s.... [Nevertheless,] while Agency concern over UFOs was substantial until the early 1950s, CIA has since paid only limited and peripheral attention to the phenomena." [footnote omitted]

Quintanilla, Hector, Jr. "The Investigation of UFO's." Studies in Intelligence 10, no. 4 (Fall 1966): 95-110.

In December 1947, the Air Technical Intelligence Center was given responsibilty within the government for collecting and analyzing "all information concerning [unexplained] sightings which could be construed as of concern to the national security." This work became Project Blue Book. Various studies followed over the years. The article details many of the potential causes of "UFO" sightings.

Ziegler, Charles A. "UFOs and the US Intelligence Community." Intelligence and National Security 14, no. 2 (Summer 1999): 1-25.

Abstract: "UFO ... phenomena have been a prominent feature of the cultural landscape in the US for the past half century. Throughout this ... period, US intelligence agencies have been involved in one way or another with these phenomena. This article describes how, as an unintended consequence, that involvement has fostered public acceptance of the belief that some UFOs are spacecraft from another world."

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