With a million man standing army, I don't think Iran is worried about a ground attack, in fact Iran could overrun the US in Iraq in a matter of days. The one worry Iran has is that the Christian terrorist Bush will drop the big one. Remember, Most of our equiupment in Iraq is toast, needing refurbishing, and probably wouldn't even make it to the Iran border. Iran has tanks, missles, artillery, and planes, Yeah I know, our planes and pilots are superior, but some great damage could be done. Without the nuke option, America is a "Paper Tiger", and Iran knows it!