You know, I was deployed once with VFA-131 onboard the Eisenhower (CVN-69), and when we went through the Straits of Hormuz, Iran sent out a couple of gun boats to mess with us. Our response? We launched the alert aircraft and they buzzed the boats about 150 ft off of the water. They then turned around, and told the boats that the next pass would be more than just a low pass by.
They quickly turned around and went back. Pissed me off, because I was working the midnight to 8 shift, and had just gotten to sleep when GQ was called.
I'm guessing that the only thing that Iran would be doing would be harassing things like that, and it more than likely wouldn't result in fire being exchanged.