Frankly I've not seen this. What I have seen over and over is:
(mostly Israel plus US): We are going to bomb you.
Iran: Bring it. You'll regret it.
(mostly Israel plus US): Mommy, Mommy! Iran threatend us.
It is not that simple. For sure, the invasion of Iran won't be a cakewalk for the Americans. But that said, the Iranian armed forces remain vastly inferior to their American counterparts.
So were the Viet Cong.