U.S. Government UFO Documents:

Website Search: “UFO”

(National Security Agency/Central Security Service,

U.S. Department of Defense, Washington, D.C.)

This NSA/CSC web page presents a “UFO Documents Index”, 
two web pages  (“UFO Related Information” and “Frequently 
Requested Information”) and 58 UFO documents:

http://www.nsa.gov/applications/search/index.cfm?q=UFO

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