I'll second Jnevis mauler. Ever since the birth of the Republic we've stood for freedom of the seas. Most Of the reason for the War of 1812 was that we insisted, or tried to insist, on our rights to trade with both sides during the Napoleonic Wars. Should the Iranian Navy, such as it is choose to cruise through the Straits of Florida that's their business. The Soviets did it, the Chinese have done it, and the Russians just took a trip to Venezuela. It made some right wing idiots froth at the mouth, but cooler heads were actually glad, because it was a de facto acknowledgement of our doctrine of freedom of the seas. The Straits of Formosa, the Straits of Florida, and the Straits of Hormuz. Its all the same. As long as you stay in International waters its your right to be there. Now, that doesn't mean you don't go on alert, but it is in the interest of every country, including Iran to respect that.
Lets take this one step further. Let's say Iran did close the straits and we couldn't or wouldn't stop them. Who would get hurt worse, us or them? Remember that the rocket scientists in Iran made the brilliant decision to not build gas refineries. So they export crude oil and import refined fuel (gee, that was a great idea). That's why they want nukes, to generate electricity, because all that oil is useless till it is refined. Now, while that may not pass the giggle test, its also true in that without imported fuel, they are SOL. Same with food, electronics and all the rest of it. Minus gulf oil, we'll take a big economic hit, but if we turn off the pipelines to and from turkey, and no ships get through? The Iranians will be devastated while we are merely severely inconvienced.
FQ13 who ain't skeered a bit.