The bunker buster is the biggest weapon in our military's arsenal. It's known as the massive ordnance penetrator, or M.O.P.
Air Force Secretary Michael Donley was asked this week whether the bomb is ready for action and he said, "If it needed to go today, we would be ready to do that."
At least 20 bunker buster bombs have been made by Boeing. They're more than 20 feet long and they weigh some 30-thousand pounds. One of the weapon's primary missions is to pulverize bunkers that could be up to 200 feet below the earth's surface. And, it just so happens Iran has these underground facilities.
The only problem is our military's bunker busters may not be powerful enough to destroy them, so an upgrade is in the works. This all comes as the Washington Post reports Iran is building up its military arsenal with missiles that could potentially hit U.S. ships in the Persian Gulf.
OutFront Friday: CNN's Pentagon Correspondent Barbara Starr and Retired Air Force Colonel Cedric Leighton.