Not sure off the top of my head if we are talking about the same guy, but one of the traitors from WTC-1 used to train special op troops, IIRC. He certainly would have some knowlege of sniper tactics.
I have to go out for a bit, but will check my notes when I return.
Nonetheless, I still think I read somewhere that he actually trained special forces...
Wasn't the head of the al Qaeda cell that was planning to blow up the U.S. embassy in Paris trained in the al Qaeda camps in Afghanistan?
I don't know.