Somewhere in the eastern Atlantic, the USS George H.W. Bush is making 30 knots toward the Mediterranean. Behind her steam three Arleigh Burke-class destroyers and a Ticonderoga-class cruiser. Ahead of her, already on station in the Arabian Sea and the Gulf, sit the USS Abraham Lincoln and the remnants of the USS Gerald R. Ford strike group. When the Bush arrives, the United States will have three carrier strike groups in and around the Persian Gulf — the largest concentration of American naval power in the Middle East since the opening weeks of the Iraq War in 2003. That is not a coincidence. It is a signal. And it raises a question worth answering in detail: what can three carrier strike groups actually do? The short answer is: almost anything. The long answer is more interesting.

What Each Carrier Brings

A single carrier strike group is built around one nuclear-powered aircraft carrier and its air wing of roughly 70 aircraft. But the carrier never sails alone. Its escort typically includes two to three guided-missile destroyers, a cruiser, and at least one fast-attack submarine lurking somewhere beneath the surface. Together, they form an integrated air defence, anti-submarine, and strike network that can cover hundreds of thousands of square miles of ocean. The Lincoln has been in the region since before Epic Fury began. Her air wing has been flying combat sorties for weeks. The Ford — the Navy’s newest and most advanced carrier — deployed to the Red Sea in late February but suffered a laundry-room fire in March that forced a stop in Crete for repairs. Some of her escorts remain on station in the Gulf, and her air wing may have cross-decked aircraft to the Lincoln. The Bush left Norfolk on March 31 with a fresh crew and a full air wing. She is the cavalry.

The Firepower Equation

Three carrier strike groups in the same theatre represent a staggering amount of combat power. The combined air wings can generate more than 300 strike sorties per day — roughly equivalent to the entire air force of a medium-sized European country. The escort ships carry hundreds of Tomahawk cruise missiles (though those stockpiles are under strain — see our related coverage), Standard Missiles for air and missile defence, and anti-submarine torpedoes. The real force multiplier, though, is redundancy. One carrier can be taken offline for maintenance or repositioned without leaving a gap. Two carriers can maintain continuous combat air patrols. Three carriers can sustain high-intensity strike operations while simultaneously enforcing a naval blockade and defending the force against missile and drone attack. In the confined waters of the Persian Gulf, however, carriers are also targets. Iranian anti-ship ballistic missiles, cruise missiles, fast-attack boats, and mines all pose threats that cannot be dismissed. The Navy learned in the Tanker War of the 1980s that the Gulf is a treacherous operating environment even without a full-scale conflict.

Why Three Matters

The decision to deploy a third carrier is as much political as it is military. Three carriers signal to Iran — and to the world — that the United States is committed to this fight for the long haul. It also signals to allies and adversaries in the Pacific that the Navy can sustain a major operation in one theatre without completely abandoning another. Whether that signal is believable is another question entirely. The Lincoln’s crew has been deployed for months. The Ford is in drydock. The Navy’s total carrier fleet stands at eleven — and with three committed to the Gulf, the Pacific Fleet is stretched thinner than at any time since the early 2000s.

Three carriers in the Gulf is a statement. The question is whether the Gulf — with its mines, missiles, and political complexity — will let the statement stand unchallenged. Sources: USNI News, Bloomberg, The War Zone, Fortune, Stars and Stripes