US Navy destroyers are firing top interceptors to bring down Iranian missiles flying into NATO airspace

• A US Navy destroyer used an SM-3 interceptor to down an Iranian ballistic missile on Friday.
• It's the third time in two weeks that a Navy destroyer used the SM-3 to defend NATO airspace.
• SM-3s are among are top missile interceptors, but they come with a hefty price tag.

US Navy destroyers operating in the Eastern Mediterranean Sea have been launching SM-3s — among America's most high-end interceptors — to defend NATO airspace against incoming Iranian ballistic missiles.

On Friday, the Arleigh Burke-class destroyer USS Oscar Austin fired at least one SM-3, or Standard Missile-3, interceptor to bring down an Iranian ballistic missile in Turkish airspace, a defense official told Business Insider.

It marked the third time since February 28, when the US and Israel started striking Iran, that a Navy destroyer has used an SM-3 to down an Iranian missile in Turkish airspace, said the official, who spoke on the condition of anonymity to discuss military developments.

Turkey's national defense ministry said earlier that NATO air and missile defense assets deployed to the Eastern Mediterranean intercepted the Iranian missile. There were no casualties or injuries, although debris fell in the southern city of Gaziantep.

Turkey hosts several important bases for American and NATO forces, including Incirlik and Konya air bases, and an Iranian strike against those facilities could trigger a significant escalation in a war that has already spread across the Middle East.

The Oscar Austin is one of three American destroyers currently positioned in the Eastern Mediterranean. The use of SM-3 interceptors comes amid broader air defense operations across the Middle East. The US and its allies in the region have shot down thousands of Iranian missiles and drones since the start of Operation Epic Fury less than two weeks ago.

The SM-3 uses a kinetic kill vehicle to destroy short- to intermediate-range missiles during the midcourse phase of flight. It can engage targets in space, unlike the Navy's other interceptors, and is outfitted on Arleigh Burke-class destroyers and Ticonderoga-class cruisers.

There are multiple variants of the SM-3, manufactured by US defense giant RTX and, for the latest variant, Mitsubishi Heavy Industries.

US destroyers first used their SM-3s in combat in April 2024 to defend Israel from an Iranian missile attack, and the US Navy fired them again several months later in October after another barrage from Tehran.

These interceptor missiles don't come cheap, though. The SM-3 Block IB variant, for instance, is estimated to cost roughly $10 million on the low end, while the newer Block IIA costs around $28 million.

It's unclear how many SM-3s the Navy has expended during combat in the Middle East. Air defense doctrine can call for firing at least two interceptors for each incoming missile, so the bill for the latest engagements above Turkey could already be substantial.

Navy leadership has warned in recent years that the US has been firing its SM-3s at an alarming rate. Service officials have warned that they need a lot more of these interceptors to counter threats in the Pacific, such as China and its theater ballistic missiles.