Just my opinion.
Good one
There are about 500 Minuteman silos. Add in the B-52, B-1 and B-2 bases, not to mention all the places where the "special" weapons for the tactical fighters are stored (F-15E,F-16, F/A-18), making for a lot of places that have to be taken out to seriously compromise our ability to nuke a country like Iran, and it's pretty much impossible.
However, IMHO, the Angry Ayatollahs and Insane Imams don't really care if we retaliate. A Martyr for Allah, is a martyr rather they kill themselves, or we do for them. Wholesale paradise, so to speak. If it brings on the 12th Imam, well it'll be worth the "sacrifice", if a bit hard on the virgin supply.
Not even close. There is NO way Iran would be able to take out the ICBM fields in the north. SAC bases are guarded heavily as well. The ONLY place Iran could stroke at us is at political and soft targets.