First off you need to go back and study the Iraq/Iran war. The Iraqis did everything wrong a modern mechanized army can do. There is nothing to compare against the American army. Not in weapons, tactics, intelligence, mobility. Nothing!
Saddam didn't "stop" his army as much as his army was simply incapable of sustaining offensive operations. You saw another variation of it in the Gulf wars, as you did in the Arab/Israeli wars. Lets face it! The Arabs don't understand modern war. They seem to have never learned how to use the sights of their tanks nor to deploy them as blitzkrieg offensive assets.
And neither does someone who thinks 10 millions Iranians are going to stand up and just start marching, like The Children of the Corn, across the Middle East leaving a swath of destruction in their wake. Youve seen to many movies. Even infantry heavy armies have to be armed, supplied, Led, supported....ect Which means they have a weak link we can severe.
But lets go with this Children of the Corn scenario for a moment. Remember The Highway of Death? Imagine such a barrage against humans with pitchforks/AKs? The American air forces are so dominating they will fly over the battlefield at will. The fact is such a wave will probably never even get within rifle range, If! It even knows where our forces are in the first place. And every other resource Iran has that lets it function as a modern country would be annihilated as well. Including its leadership! And there is no "safety in the night" for infantry like in the Korean war. If anything we prefer to fight in the night. We can see. They cant!
Such a peoples mob might have relevance If another country invaded the place but no-one is even considering that. Why should we be so stupid? It would be far easier to level the place. To be fair Iranian regulars and irregulars fought with great bravery during their war with Iraq.
Long Live USA, among your other inconsistencies, this war was primarily a border war. The Iraqis never got close to Tehran and never seriously threatened it. I have some good resources about the war if you'd like to read them before you posted again.