That is the real lesson behind Operation Iraqi Freedom. The run to Baghdad and its capture lasted how many days? And how long did we fight the irregular stay behinds?
For many years I read and professionally commented on various war scenarios and conferences designed to establish logistic requirements. The DOD stopped when the last conventional (building, bridge, airfield, sea port) was theoretically destroyed, for the first time. Addressing enemy combat repair and irregular warfare NEVER entered into those discussions. Even when I publicly rubbed their individual and collective noses in their own sh***y falsehoods I was told they couldn't do anything else because of the procedures and policies they had to use.
Until Islam voluntarily under goes a reformation and Renascence level social and religious experience there can be no peace between us. Proof of statement - how many contemporary Islamic politicians are still complaining out the Crusades - events that happened between 1095 and 1291 AD as if they happened within our lifetimes?
The IRGC and Basij make the Saddam Fedayeen, Al Queda in Iraq, and the Taliban combined look like a joke.
Anyway, the goal, of course, is neither invasion or regime change. It’s the elimination of Iran’s ability to project power - the Air Force, ballistic missile forces, the regular Navy, and the IRGC Navy.