Nuclear Exchange between Iran and Israel

[TinCow]

But with all this talk of nuclear fun, i have a question - where is our lord and master, the United States, in all of this?

If Iran launched a nuclear strike against Israel, the US would most likely declare war against it. A real declaration of war, not one of these Vietnam and Iraq presidential police action things. An unprovoked nuclear attack on Israel would also sway the vast majority of US public opinion (likely 90%+) into approval of such a war. The public may even support the re-introduction of the draft in such a situation. If the war lasted for more than a week, I would expect a full-scale mobilization in the US.