And since no one else will Red Team this exercise...
Some possible counter tactics.
1) Global terrorism. There are Shiite communities throughout the Arab world - Iran is probably in touch with their dissidents even if Tehran doesn't support them. These communities would provide ready support for terrorism and sabotage through Saudi Arabia, for example.
2) Trouble in Iraq. Many Shiite militias (who are the most powerful group there, right now) have significant backing from Iran. With a porous border, the Iranians can run weapons and agents through there with no problem. Currently, Iraqi militias lack the will and equipment to fight US troops. Given a motivation, and more advanced RPG warheads, small arms ammunition and body armor they could prove a major threat to our troops in most of the country.
3) Preemptive strike. Our forces take months to build up to strenght. The Iranians could easily decide to launch a suicidal ground, air or naval assault figuring they have nothing left to lose. Such an assault wouldn't have to be targetted at our soldiers to screw us, either: the oil infrastructure in the region can't take that many cruise missiles to shut down.
4) Continuity of Government. They'd certainly put a plan in place to keep their government operational. Unlike Iraq, which was a dictatorship, they can put such a thing together. Iran is governed by an elected leadership with a broad base of support - they can have enough successors on hand that they can replace whatever Mullahs we do catch. Moreover, they'll make efforts to hide their people and protect them.
5) Infrastructure protection. Camouflage, Hardening, redundancy and reparability. We can fly a plane over anything and bomb it. But of course, first we have to find it. Then the bomb has to actually destroy it. They have to care about losing it. And they can't just fix it two days later. This applies to pretty much anything you can name.
6) Consolidation of Power. They're not going to let a lot of insurgents hide our in their own population. In the run up to war, the smart move is to neutralize these people by whatever means necessary, because they're certain allies of the invader. Likewise, you're going to purge your armed forces of any disloyal, unprofessional or unmotivated elements ahead of time. The lessons from Iraq and Afghanistan should be obvious.
7) Preparation for guerilla warfare. This involves teaching troops infantry, hit and run tactics, sabotage and tradecraft. It also involves caching weapons and supplies throughout the countryside and the cities. Sniper training is a big deal here - most armies don't focus on it the way they should.
8) Scorched earth. They may well decide to destroy anything that could be of use to us. The road nets in and out of the country probably aren't good to begin with - once the enemy takes to them with everything from bulldozers to sledgehammers you're going to find the fuel, ammo and rations necessary for high intensity maneuver war a lot harder to supply.
9) Preparation for the latest US ground technology. Old style (single warhead) RPGs don't reliably get effects on US ground vehicles. Newer tandem warhead models are effective against Bradley Fighting Vehicle and Stryker with slat armor. Steel core AK-47 rounds can't penetrate Interceptor with SAPI. The ammo that can is a little hard to improvise or get ahold of, but not impossible. It wouldn't take much of this stuff in the right hands to make their snipers highly dangerous. Night vision gear is handy stuff, too. Older generation gear isn't as effective as what US troops use, but its main purpose is to show soldiers (in training) the kind of thing they're up against.
10) Preparation of citizen militias. These groups are there to help you regain control after US forces leave. Their job isn't so much to fight back, as to prevent whatever cheapass native forces we leave in place from being a problem later. Factional fighting won't happen if you murder all the factions anyway. They can also suicide bomb our troops on the side.
11) Evacuation of key personnel. What happens to your brilliant plan if half the Mullahs turn up in Moscow or Beijing? You think the Russkies will hand them right over? You think we'll invade Red China to get them? Or would you rather stick around and nation build in Iran to keep them from coming right back in. Hey, why stop at the Mullahs? Ten thousand Revolutionary Guards could suddenly go on leave in the third party country of your choice. What then? If they picks folks with clean backgrounds, who've never been implicated in any kind of war crime, they could even vacation in Europe!
That's eleven steps I'd recommend - and any one of them could throw a real kink in our plans for a short victorious war.
Hey, I'm your Huckleberry
I'll play blue team. My backround 3 years 82nd airborne,2 special assignments with 5th Special Forces. Semi-retired Police Officer. Went to college for a little while,fell asleep alot. Should take you 10 minutes to win. I fight unconventionally you do what ever you want. Keep it civil nothing personal learning experience for all. Deal?? I am work now may not be able to respnd fast.