U.S. Government UFO Documents:

“SUBJECT: 
Congressional Investigation of the UFO Program”

by Colonel Edward H. Wynn, U.S. Air Force, 
Deputy for Science and Components,

14 July 1961 and 3 August 1961 
(Headquarters Foreign Technology Division, 
Air Force Systems Command, United States Air Force, 
Wright-Patterson Air Force Base, Ohio)
(The UFO Chronicles, 30 September 2012)

The two documents (letters) were presented by The UFO Chronicles on 30 September 2012:

http://www.theufochronicles.com/2012/09/congressional-investigation-of-ufo.html

The letters were sent to General Pierce.

Aerial view of Wright-Patterson Air Force Base, Dayton, Ohio
(wikimedia.org) (wikimedia.org photo)