31MAR

Arrow-3 stocks hit 81 per cent drain

2 min read

08:23UTC

RUSI data shows the missile shield protecting Israel and the UAE will be materially degraded by mid-April. Rebuilding takes years.

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ConflictDeveloping

Key takeaway

Iran does not need to win the air war; it needs to outlast the interceptors.

RUSI's "Command of the Reload" report documented 11,294 munitions expended in the campaign's first 16 days at an estimated cost of $26 billion. Arrow-3 interceptors are at 81% depletion by end of March. THAAD stocks are "approximately one month or less" from exhaustion at current expenditure rates . ¹

Replenishment is not a logistics problem; it is an industrial one. A single Arrow-3 interceptor costs $2 to $3 million and takes months to produce. Full stock rebuild: two to three years. The missile defence architecture protecting Israel, the UAE, and US forces will be materially degraded by mid-to-late April.

Deep Analysis

In plain English

The US and Israel have been intercepting Iranian missiles and drones using expensive specialist rockets called interceptors. Each intercept uses one up. RUSI, a respected defence think tank, calculated that Israel's best interceptors are 81% exhausted. The US's top-tier system, THAAD, is roughly one month from running out. Each interceptor costs $2-3 million and takes months to produce. Rebuilding the full stock takes 2-3 years. Iran does not need to win the air war; it just needs to keep firing until the defensive rockets run out.

What could happen next?

Risk
Arrow-3 exhaustion in mid-April degrades Israeli protection against Iran's long-range ballistic missiles at the moment THAAD is also near exhaustion.
Consequence
Interceptor depletion creates a forcing function for all other deadlines: the 6 April grid deadline, the Kharg timeline, and the War Powers clock all operate inside a window shaped by shield degradation.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: The Soviet attritional strategy in Afghanistan (1979-89) succeeded not by defeating the Mujahideen militarily but by exhausting the adversary's will and resources. Iran's missile-drone strategy applies the same logic to defensive munitions rather than offensive will: exhaust the interceptors, then strike through the degraded shield.

Counter-parallel: The 1973 Yom Kippur War's early days saw Israeli munitions near depletion before a US emergency resupply reversed the trajectory. No comparable resupply mechanism exists for Arrow-3 or THAAD interceptors at the scale and speed required here.

A single Arrow-3 interceptor costs $2-3 million and takes months to build. Full Arrow-3 stock rebuild: 2-3 years at current production rates. THAAD annual production is approximately 48 interceptors; the entire global THAAD arsenal was 25% depleted in the first eight days .

The $26 billion estimated 16-day campaign cost reflects this asymmetry: Iran fires Shaheds at $20,000-50,000 each; the US intercepts with THAAD and Arrow-3 at $2-3 million each. Iran sustains the exchange rate indefinitely with Russian industrial supply; the US cannot.

Consensus view: RUSI's 'Command of the Reload' report documented the attritional dynamic that multiple US defence analysts had flagged since early March . The Center for Strategic and International Studies estimated the first 100 hours of operation at $3.7 billion, with munitions costs dominating. The production-versus-consumption gap is structural: Lockheed Martin produces approximately 48 THAAD interceptors per year.

Counter-view: US officials have suggested emergency production surge authority could accelerate output. Israel's NIS 2.6 billion emergency procurement indicates awareness of the depletion problem and efforts to address it before exhaustion.

Key tension: Production surge takes months to yield interceptors. The shield degrades in weeks. The gap between production timescale and depletion timescale is the strategic asymmetry Iran is exploiting.

Sources:Pentagon / The Intercept / Novara Media

Mentions:RUSI →Afghanistan →Center for Strategic and International Studies →Iran →Yom Kippur War →Lockheed Martin →attrition →Israel →Prima →Arrow-3 →THAAD →

First Reported In

Update #58 · First US aircraft fall over Iran

Pentagon / The Intercept / Novara Media· 4 Apr 2026

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Causes and effects

Caused by

UAE Stops 2,469 Missiles and Drones

The sustained intercept rate consuming Arrow-3 and THAAD stocks is the underlying cause of the depletion crisis RUSI documented.

Occurred 1 Apr 2026

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This Event

Arrow-3 stocks hit 81 per cent drain

Interceptor depletion is the hidden clock governing every other deadline in this conflict.

Led to

Iran War Burns Through Pacific Missile Reserves

Arrow-3 at 81% depletion and THAAD within one month of exhaustion form the missile defence context in which the JASSM-ER Pacific stock depletion compounds overall US munitions crisis.

Occurred 4 Apr 2026

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Interceptor Crisis Reaches Projected Depletion Window

Arrow-3 at 81% depletion and THAAD one month from exhaustion (ID:1935) projected thresholds now appear to have been reached.

Occurred 6 Apr 2026

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Different Perspectives

Markets

Brent crude rose 2.2 per cent to $96.34 on 10 June, reversing a 7 per cent weekly decline built on deal optimism, as the overnight exchange repriced the Strait of Hormuz risk premium in a single session. The move reflects transit-risk repricing rather than supply shock: Iran's exports had already collapsed to below 300,000 barrels per day.

Pakistan

Pakistan's Naqvi channel, the only mediation track carrying both civilian and military buy-in, was stress-tested by live ordnance within 48 hours of the 6-7 June Tehran visit. Whether Washington informed Islamabad of the imminent strike plan while Naqvi was in Tehran remains undisclosed, putting the channel's neutrality under scrutiny.

Kuwait

Kuwait hosted the third Iranian strike on its soil since the 3 June airport drone attack, with Ali Al Salem airbase targeted in the three-country salvo. Its recent $1.98 billion Anduril Anvil counter-drone purchase signals it is rearming rather than reconsidering its hosting posture.

Bahrain

Bahrain absorbed the IRGC barrage via PAC-3 intercepts with its magazine already at 87 per cent depletion and no resupply before 2027. Sounding air-raid sirens over Manama, it faced the intercept burden with the thinnest defensive stack in the Gulf coalition.

Jordan

Jordan reported all five incoming missiles intercepted with no injuries and no damage, a clean defensive performance that strengthens Amman's case for staying in the Western coalition without escalating its own posture. It now sits on Iran's target list for the first time despite not being a party to the Abraham Accords confrontation.

Iran / IRGC

Foreign Minister Araghchi posted on X that US forces should 'leave our region if you want to be safe' and framed the exchange as a US defeat, while the IRGC claimed 21 targets hit and an F-35 hangar destroyed. The claims serve a domestic and Arab-audience framing rather than a verified battle-damage assessment.