Bob Arnot, reporting live from Iraq for MSNBC, just reported that the U.S. has found SA-18 SAM's in some Iraqi trenches. He described this weapon as being very sophisticated, capable of discerning between chaff and other countermeasures that our aircraft use. He described this weapon as being a real threat to Coalition aircraft. Questions: 1. What are the specs & capabilities of this weapon? 2. Where did the Iraqis get them from?