Ok. Here is where you arent understanding why we moved as many troops as we did though. You seem to think we brought over a large amount of troops to fight the war and to take over. They were not fighting any army they were simply on ground to secure and restructure. There was some resistance but most of what is fought is small militia groups not some Iraqi army. Irans military is far more advanced then Iraqs and by no means would it just be some walk in the park task for the US. But it is a far cry from something that we cant handle. What it comes down to is that our air defense and air support are too far superior for them to fight. This will enable us to disable most of their force without much of an issue.