I had to do some googling -- didn't know the name of that unit, but this interesting article dated 2002 came up by Gaffney:
Was Saddam the Man Behind McVeigh?
http://www.frontpagemag.com/Articles/ReadArticle.asp?ID=4688
If you read The Third Terrorist, you will see the connections, in Hussein Al Husanni (sp) and unit 999.