Iran can certainly defend itself quite well from any US or Israeli aggression, but I doubt any will come from the US as we are already over extended and desperately need Iranian help in Iraq if US ever expects to get out. And after its second defeat in Lebanon, I doubt that Israelis could even consider trying to attack Iran on its own. So with all the rhetoric from both sides aside, I don't think the US will meddle with Iran unless we want to spend every dime of our treasury rebuilding the ME instead of our own ailing bridges and infrastructure.
Report: blood tests show ISIS used mustard agent against Kurdish fighters (Reuters)
from the article: Revolutionary Guards: Iran can penetrate Israel's Merkava tanks