What War With Iran Would Look Like

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A Pentagon official says that among the known sites there are 1,500 different "aim points," which means the campaign could well require the involvement of almost every type of aircraft in the U.S. arsenal: Stealth bombers and fighters, B-1s and B-2s, as well as F-15s and F-16s operating from land and F-18s from aircraft carriers.

GPS-guided munitions and laser-targeted bombs—sighted by satellite, spotter aircraft and unmanned vehicles—would do most of the bunker busting. But because many of the targets are hardened under several feet of reinforced concrete, most would have to be hit over and over to ensure that they were destroyed or sufficiently damaged. The U.S. would have to mount the usual aerial ballet, refueling tankers as well as search-and-rescue helicopters in case pilots were shot down by Iran's aging but possibly still effective air defenses. U.S. submarines and ships could launch cruise missiles as well, but their warheads are generally too small to do much damage to reinforced concrete—and might be used for secondary targets. An operation of that size would hardly be surgical. Many sites are in highly populated areas, so civilian casualties would be a certainty. Whatever the order of battle, a U.S. strike would have a lasting impression on Iran's rulers. U.S. officials believe that a campaign of several days, involving hundreds or even thousands of sorties, could set back Iran's nuclear program by two to three years. Hit hard enough, some believe, Iranians might develop second thoughts about their government's designs as a regional nuclear power. Some U.S. foes of Iran's regime believe that the crisis of legitimacy that the ruling clerics would face in the wake of a U.S. attack could trigger their downfall, although others are convinced it would unite the population with the government in anti-American rage.

But it is also likely that the U.S. could carry out a massive attack and still leave Iran with some part of its nuclear program intact. It's possible that U.S. warplanes could destroy every known nuclear site—while Tehran's nuclear wizards, operating at other, undiscovered sites even deeper underground, continued their work. "We don't know where it all is," said a White House official, "so we can't get it all."

What Would Come Next?

No one who has spent any time thinking about an attack on Iran doubts that a U.S. operation would reap a whirlwind. The only mystery is what kind. "It's not a question of whether we can do a strike or not and whether the strike could be effective," says retired Marine General Anthony Zinni. "It certainly would be, to some degree. But are you prepared for all that follows?"

Retired Air Force Colonel Sam Gardiner, who taught strategy at the National War College, has been conducting a mock U.S.-Iran war game for American policymakers for the past five years. Virtually every time he runs the game, Gardiner says, a similar nightmare scenario unfolds: the U.S. attack, no matter how successful, spawns a variety of asymmetrical retaliations by Tehran. First comes terrorism: Iran's initial reaction to air strikes might be to authorize a Hizballah attack on Israel, in order to draw Israel into the war and rally public support at home.

Next, Iran might try to foment as much mayhem as possible inside the two nations on its flanks, Afghanistan and Iraq, where more than 160,000 U.S. troops hold a tenuous grip on local populations. Iran has already dabbled in partnership with warlords in western Afghanistan, where U.S. military authority has never been strong; it would be a small step to lend aid to Taliban forces gaining strength in the south. Meanwhile, Tehran has links to the main factions in Iraq, which would welcome a boost in money and weapons, if just to strengthen their hand against rivals. Analysts generally believe that Iran could in a short time orchestrate a dramatic increase in the number and severity of attacks on U.S. troops in Iraq. As Syed Ayad, a secular Shi'ite cleric and Iraqi Member of Parliament says, "America owns the sky of Iraq with their Apaches, but Iran owns the ground."

Next, there is oil. The Persian Gulf, a traffic jam on good days, would become a parking lot. Iran could plant mines and launch dozens of armed boats into the bottleneck, choking off the shipping lanes in the Strait of Hormuz and causing a massive disruption of oil-tanker traffic. A low-key Iranian mining operation in 1987 forced the U.S. to reflag Kuwaiti oil tankers and escort them, in slow-moving files of one and two, up and down the Persian Gulf. A more intense operation would probably send oil prices soaring above $100 per bbl.—which may explain why the Navy wants to be sure its small fleet of minesweepers is ready to go into action at a moment's notice. It is unlikely that Iran would turn off its own oil spigot or halt its exports through pipelines overland, but it could direct its proxies in Iraq and Saudi Arabia to attack pipelines, wells and shipment points inside those countries, further choking supply and driving up prices.

That kind of retaliation could quickly transform a relatively limited U.S. mission in Iran into a much more complicated one involving regime change. An Iran determined to use all its available weapons to counterattack the U.S. and its allies would present a challenge to American prestige that no Commander in Chief would be likely to tolerate for long. Zinni, for one, believes an attack on Iran could eventually lead to U.S. troops on the ground. "You've got to be careful with your assumptions," he says. "In Iraq, the assumption was that it would be a liberation, not an occupation. You've got to be prepared for the worst case, and the worst case involving Iran takes you down to boots on the ground." All that, he says, makes an attack on Iran a "dumb idea." Abizaid, the current Centcom boss, chose his words carefully last May. "Look, any war with a country that is as big as Iran, that has a terrorist capability along its borders, that has a missile capability that is external to its own borders and that has the ability to affect the world's oil markets is something that everyone needs to contemplate with a great degree of clarity."

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