Iran looks like it wants to tussle.  The US is more than game.  Iraq was more of a threat, and we rolled them in a matter of hours.  Iran will take less time.  Unless we station troops and move in and try to set up housekeeping. 
I’d suggest a blitzkrieg, sink their ships, demolish their military assets, and all of their suspected nuke sites… Then get the Hell out of dodge before the dust settles.
George Bush’s big folly was the Mission Accomplished sign while we still had boots on the ground.  Let’s not relive that mistake.
Take all US Forces in the Stan, get them ready to roll… Then wait for Iran to blink first.  The moment they twitch, nail them.  Follow Sun Tsu’s advice. Hit them first, and hit them so hard that they can’t hit back.  Don’t look at the explosions, just walk away. Done.  Then when China talks Shit, we can just crack our knuckles and grin.