The US has made noises about going to war with Iran. I recall the US military wanted to attack Iran after they shot down a US drone. Trump declined. I am not saying US bad Iran good. I am saying that Iran could not match US military. So asymmetric warfare is likely.
I'll bet lots of Iranian soldiers already form sleeper cells in US to be activated if there is a war. Not crazy Jihadis but well trained. Think of all the soft US targets like transmission lines, pipelines, maybe a few skyscrapers.