Iran's military is, quite frankly, a joke. Their air assets consist of fewer than 100 aging American F-4s and F14s sold to the shah in the 60s and 70s. Their navy fields a handful of rusting frigates, three Russian-built Kilo-class submarines which are always in dry-dock (the Iranians don't know how to effectively use them), and a bunch of fast-attack craft which are nothing more than civilian speed boats with machine guns and a single missile mount. The US carriers would sit hundreds of miles away in the Arabian Sea, protected by a ring of cruisers, destroyers, frigates, submarines, and a massive combat air patrol of F/A-18s and F-14s. Iran wouldn't even get within sight of our fleet, while our land-based air assets, combined with naval aircraft and cruise missiles, would grind them to powder. Add a scattering of Navy SEAL landings at key points (more than enough to slaughter the "elite" Revolutionary Guards), and they'd be on their knees in a week, with a wrecked infrastructure.
U.S. envoy to UN visits Cuba's UN Mission, a first in decades (AP)
from the article: Top U.S. official: Military strike on Iran was never 'off the table'