• A US air defense system in Israel was just used in combat for the first time since it was deployed.

• It's unclear if the THAAD battery successfully intercepted the incoming threat.

• The battery was reportedly used against a Houthi ballistic missile late last week.

A top US air defense battery deployed to Israel was recently used in combat in what appears to be the first known instance that the system fired an interceptor since it arrived in the country two months ago.

The THAAD (or Terminal High-Altitude Area Defense) battery was used in theater over the past couple of days, a US defense official confirmed to Business Insider on Monday. They did not elaborate on the circumstances of the incident, the kind of missile attack THAAD was designed to counter.

Footage shared on social media Friday purported to show the launch of a THAAD interceptor in Israel against an incoming ballistic missile fired by the Houthis in Yemen. A US soldier can reportedly be heard in the background of the video saying, "Eighteen years [I've] been waiting for this."

It's unclear whether the THAAD shot was successful. The Israeli military said early Friday local time that a missile launched from Yemen was intercepted before crossing into Israeli territory. It did not specify which air defense system was actually used to take down the threat.

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The US deployed a THAAD battery and around 100 soldiers to Israel in October following a massive Iranian missile attack on the country at the start of the month. The Pentagon said then that the system would supplement Israel's advanced and multi-tiered air defenses.

THAAD, which is made by US defense contractor Lockheed Martin, is designed to defeat short-, medium-, and intermediate-range ballistic missiles during the final phase of their flight. The system can engage targets at ranges of 93 to 124 miles inside and outside the atmosphere and eliminates an incoming threat by hitting it rather than exploding nearby.

The US Army began developing THAAD in 1992, and it now has seven batteries, several of which are outside the continental US. A typical battery consists of nearly 100 soldiers, six truck-mounted launchers, an advanced radar, and a fire control and communications element.

THAAD's first operational intercept in combat came in January 2022 when a battery used by the United Arab Emirates took down a Houthi ballistic missile. Though it has rarely seen combat, THAAD is still considered to be one of the top air defenses in the world; Israel's equivalent to the THAAD, the Arrow 3, has also proved its worth in combat.

Last year, the US sent a THAAD battery to the Middle East to protect American troops after Hamas carried out its Oct. 7, 2023, massacre in Israel. The October deployment strengthens Israel's vaunted air-defense shield against missiles, consisting of David's Sling and the Arrow systems. The widely touted Iron Dome, by contrast, is designed to counter rockets and artillery shells.

Israel is retiring the US-made Patriot battery. The Israelis soured on the Patriot after their early version failed to defeat Scud missiles fired by Iraq in 1991. Later upgrades would transform Patriot into a critical defensive asset for Ukraine in its war against Russia.

The recent employment of the THAAD battery comes amid a notable uptick in Houthi missile and drone attacks on Israel over the past few weeks. Israeli forces have bombed the rebels in Yemen in retaliation.

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