SPACE.com -- X Files Opened: The National Security Agency's UFO Investigations Unearthed

Interesting article. It doesn't talk really about UFOs. What it talks about is why all these UFO related documents were hidden. It seems that releasing these documents would reveal the NSA's international Communications Intercept (COMINT) throughout the world.

That and UFOs are a bunch of crap anyways ;)

Article from Space.com:
SPACE.com -- X Files Opened: The National Security Agency's UFO Investigations Unearthed

Direct link the the affidavit:
In Camera Affidavit of Eugene F. Yeates: Citizens Against UFO Secrecy v. National Security Agency, October 9, 1980