The U.S. military has depleted nearly half its Terminal High Altitude Area Defense (THAAD) interceptors while defending Israel from Iranian missile attacks, according to Defense Department assessments cited across multiple outlets, with officials warning of cascading risks to global alliances.
U.S. Missile Defense Stockpiles Under Strain
The U.S. deployed over 200 THAAD interceptors during operations to defend Israel, accounting for roughly 50% of the Pentagon’s total inventory, while Israel used fewer than 100 Arrow 3 and David’s Sling interceptors, according to reports from The Washington Post and The Jerusalem Post. Additionally, U.S. naval vessels fired more than 100 Standard Missile-3 and Standard Missile-6 interceptors, with Israel’s defenses focusing on lower-tier threats like Houthi and Hezbollah projectiles.
“The numbers are striking,” said Kelly Grieco, a senior fellow at the Stimson Center, noting that the U.S. “absorbed most of the missile defense mission while Israel conserved its own magazines.” The depletion has left the U.S. with roughly 200 THAAD interceptors, a figure that analysts warn is insufficient to meet demands in Asia, where Japan and South Korea rely on American deterrence against North Korea and China.
Israel’s Strategic Calculus and Operational Balance
Israeli officials emphasized that both nations shared the defensive burden equitably during operations like Epic Fury, citing coordinated use of fighter aircraft, counter-UAS systems, and layered missile defenses. “Both Israel and the United States carried the defensive burden equitably,” said Sean Parnell, the Pentagon’s chief spokesman, in a statement cited by The Jerusalem Post. However, the data reveals a stark imbalance: the U.S. engaged twice as many Iranian missiles as Israel, firing 120 more interceptors overall.
This dynamic has raised questions about long-term sustainability. A March 2026 study by the U.S. Congress warned that “the rate of use of THAAD interceptors during Operation Epic Fury has further reduced the limited stock of interceptors,” with production lines unable to match wartime consumption. The Pentagon has already shifted THAAD batteries from South Korea to the Middle East, a move that critics argue undermines regional stability.
Regional Concerns and Geopolitical Implications
Allies in Asia have voiced alarm over the depletion of U.S. interceptors, with Japan and South Korea particularly vulnerable. “That bill risks coming due in theaters that have nothing to do with Iran,” Grieco said, highlighting the risk of “lopsided dynamic” in U.S. defense commitments. The situation is exacerbated by Iran’s retained capabilities: The New York Times reported in late April 2026 that Iran still possesses 70% of its pre-war mobile missile launchers and 70% of its missile stockpile, according to a Middle East Eye analysis.
Trita Parsi, executive vice president at the Quincy Institute, called the U.S. sacrifice “stunning,” noting that “very understandable that many view the Iran war as ‘Israel first’ when you see these statistics.” The imbalance could complicate ongoing ceasefire negotiations, as President Donald Trump has threatened to resume attacks on Iran if terms are not met. A recent Israeli decision to take missile defense batteries offline for maintenance further threatens to widen the gap.
Production Bottlenecks and Long-Term Risks
The U.S. faces a critical shortfall in interceptor production. Lockheed Martin’s THAAD system, which costs $3–4 million per interceptor, has a manufacturing rate insufficient to replenish wartime losses within a decade. A March 2026 report by the Congressional Research Service warned that “the U.S. will need years to replenish its stock” at current rates, leaving allies exposed during prolonged conflicts.
Israel’s reliance on U.S. interceptors also raises questions about its own defense strategy. While the IDF has invested in advanced systems like the Arrow 3 and David’s Sling, its inventory remains smaller than the U.S. footprint in the region. This asymmetry has led to calls for greater bilateral coordination, including potential joint production of interceptors, though such plans remain speculative.
As tensions with Iran persist, the U.S. faces a stark choice: either accelerate production to meet global demands or accept a diminished role in deterring threats beyond the Middle East. For now, the burden of defending Israel continues to reshape the strategic calculus of alliances that have underpinned global security for decades.
