Iron Dome and Israel's layered defenses

What it is

Israel's air defense works in layers, each built for a different kind of incoming object, and the layers are supposed to hand threats off to each other. ¹ There are four of them. ¹

The bottom layer is Iron Dome, built by Rafael Advanced Defense Systems against short-range rockets and mortars, with a range the Congressional Research Service puts at 2.5 to 43 miles. ¹ Israel began developing it in 2007, finished the final tests in 2010, and deployed the first units in 2011. ² A battery has three or four launchers, a battle management and weapon control system, and an ELM 2084 fire-control radar, and each launcher holds up to 20 Tamir interceptors. ² One battery covers up to 150 square kilometers. ²

Iron Dome does arithmetic before it fires. The radar tracks the rocket, the battle management and weapon control system works out where it will come down, and the battery engages only the ones headed somewhere that matters. ² Everything else is allowed to land in a field. That is why the published numbers are framed as success against rockets selected for interception: 85 percent of 400 rockets fired from Gaza in 2012, 735 of 800 engaged in 2014, and roughly a 90 percent kill rate in 2021 against the rockets it chose to engage. ² CRS describes the system's record as a mission success rate above 90 percent. ¹

The second layer is David's Sling, co-developed by Rafael and RTX since August 2008 and operational in April 2017, aimed at long-range rockets and cruise missiles at ranges of 25 to 186 miles. ¹ It fires RTX's Stunner interceptor, up to twelve per launcher. ¹

Above that sit the two Arrow systems, both built with Israel Aerospace Industries. ¹ Arrow II, a joint effort with Boeing, has been operational since 2000 and takes longer-range ballistic missiles in the upper atmosphere. ¹ Arrow III, operational since January 2017, works outside the atmosphere against medium-range ballistic missiles. ¹ Arrow III made its first operational interception on November 9, 2023, against a target launched toward Israel from the Red Sea region, announced by Israel's Ministry of Defense and the IDF. ⁵

The United States has provided more than $6 billion for Iron Dome batteries, interceptors, co-production costs and maintenance, more than $3.8 billion for David's Sling since FY2006, and $1.5 billion for Arrow III since co-development began in 2008. ¹ It has covered roughly half the annual development costs of Arrow II. ¹ The 2016 memorandum of understanding covering FY2019 through FY2028 pledged $38 billion, of which $5 billion is defense appropriations for missile defense, and the administration pledged to request $500 million a year for programs with joint U.S.-Israeli elements, with language letting both sides agree on support above that cap. ¹

Some of the money comes home. A March 2014 co-production agreement put the U.S. workshare of Iron Dome at 30 percent as of 2023, with Tamir interceptors manufactured in Tucson, Arizona through a Raytheon Rafael joint venture formed in 2020 and assembled in Israel. ¹ David's Sling components have been built in Tucson under a June 2018 agreement, and Arrow III canisters are produced in Columbus, Mississippi by an IAI subsidiary under a June 2019 agreement. ¹

Why it still matters

A Tamir interceptor runs roughly $40,000 to $50,000, and a complete Iron Dome battery cost about $100 million to produce as of 2012 and 2013. ² The rockets it engages are short-range and unguided. ²

October 7 showed where the arithmetic breaks. From October 7 through October 16, 2023, Hamas, other Gaza-based militants and Hezbollah fired an estimated 6,000 rockets at Israel, with roughly 2,000 to 3,000 of them in the initial hours of the attack. ³ CRS laid out the logic plainly at the time: against ten rockets a battery will almost certainly stop the one that threatens something, but extrapolate to a thousand or two thousand and the advantage shifts to the attacker. ³ The rockets were also the smaller half of it. The assault came by land, sea and air, using drone munitions, personnel-capable gliders and thousands of fighters crossing Israeli-controlled lines along multiple axes. ³ More than 1,400 Israelis had been killed as of October 19. ³

The Iranian barrages tested the top layers instead. In April 2024, Iran fired approximately 120 ballistic missiles, 30 cruise missiles and 170 drones, and only about nine impacts resulted. ⁴ The October 2024 attack was larger and better coordinated, producing 44 to 45 impacts, with 32 missiles penetrating at Nevatim airbase compared to four in April. ⁴ In the twelve-day war that ended with the June 24, 2025 ceasefire, roughly 500 missiles produced about 50 to 60 identified impacts. ⁴

That still reads as a defense that works. The problem is what it consumed. Video evidence alone confirms 34 Arrow-3, 39 THAAD and 9 Arrow-2 interceptors expended, with reported upper estimates of over 150 THAAD interceptors and about 80 SM-3s, at a total defensive cost estimated between $2.694 billion and $4.682 billion. ⁴ That amounted to about a quarter of all THAAD interceptors procured since 2010 and 17 percent of all SM-3s ever delivered. ⁴ U.S. officials indicated that by the end of the war Israel was running low on anti-ballistic missiles. ⁴ FPRI concludes that's a bad sign for American and allied missile defense against larger adversaries. ⁴

Our read: layered defense buys time and lowers the body count, and it does not buy immunity. Every layer has a magazine, and twelve days emptied a quarter of the THAAD stock bought since 2010. ⁴ That is the reason lasers keep coming up. The April 2024 emergency supplemental, P.L. 118-50, included $4 billion for Israeli missile defense plus $1.2 billion for Iron Beam, the first dedicated U.S. funding for the laser system. ¹

The words you'll hear

Iron Dome. Rafael's short-range layer, deployed in 2011, which calculates a rocket's impact point and engages only the ones headed for populated areas. ²

Tamir. Iron Dome's interceptor, about $40,000 to $50,000 each, manufactured in Tucson, Arizona and assembled in Israel under the U.S.-Israel co-production agreement. ²¹

David's Sling. The middle layer, built by Rafael and RTX and operational since April 2017, covering 25 to 186 miles against long-range rockets and cruise missiles. ¹

Arrow II and Arrow III. The upper layers, built with Boeing and Israel Aerospace Industries. Arrow II has been operational since 2000 inside the upper atmosphere; Arrow III since January 2017 outside it. ¹

Iron Beam. Israel's laser defense system, which received $1.2 billion in the April 2024 U.S. supplemental, its first dedicated American funding. ¹

Saturation. Firing more rounds than the defense can engage at once. CRS described the dynamic in October 2023: high interception rates hold against ten rockets and stop holding at a thousand. ³

The MOU. The 2016 U.S.-Israel memorandum covering FY2019 to FY2028, pledging $38 billion including $5 billion in missile defense appropriations, with roughly $500 million a year requested for joint programs. ¹