The United States has emerged from its 39-day war against Iran with critically depleted munitions stockpiles and insufficient production capacity to rapidly replenish them — a vulnerability that Chinese military experts say could prove decisive in any future conflict with a major power adversary.
According to a report published Tuesday by the Centre for Strategic and International Studies (CSIS), the brief but intense conflict exposed deep structural weaknesses in American military readiness. The findings have drawn close attention from Chinese military analysts, who see in them a telling preview of how a potential confrontation with Beijing might unfold.
Missile Inventories Cut in Half
The scale of munitions expenditure during the Iran war was staggering. The CSIS report estimates that during the ceasefire period, the U.S. consumed roughly half of its Patriot air defence missiles and approximately half of its Terminal High Altitude Area Defence (THAAD) interceptors — systems that form the backbone of American missile defence architecture (CSIS, April 22, 2026).
Stockpiles of ship-launched interceptors have also been severely reduced. Both the Standard Missile 3 (SM-3) and Standard Missile 6 (SM-6), critical for naval theatre defence, have dropped significantly, according to the same CSIS assessment. These are not easily or quickly replaced: production lines for advanced interceptors operate on multi-year timelines, and the defence industrial base has historically struggled to scale output in wartime.
Among the most concerning losses is the expenditure of between 40 and 70 of the U.S. military's 90 Precision Strike Missiles (PrSM) — the most advanced munition developed for the Himars multiple rocket launcher system. With up to 78 per cent of that inventory potentially gone, the U.S. has limited reserves of one of its most capable ground-based precision strike weapons (CSIS, April 22, 2026).
Cruise Missile Stocks Take a Hit
The CSIS report further revealed that more than a quarter of the United States' 3,100 Tomahawk cruise missiles were fired during the conflict. Additionally, nearly a quarter of its 4,400 stealth Joint Air-to-Surface Standoff Missiles (JASSM) — long-range precision weapons designed to penetrate sophisticated air defences — were expended. Both systems are central to American strike planning against high-end adversaries, and their partial depletion represents a significant reduction in long-range offensive capacity.
Chinese Military Analysts Take Note
The CSIS findings quickly drew commentary from Chinese military observers, who have long studied American operational patterns and logistics. Analysts cited by the South China Morning Post noted that the Iran war has provided an unusually transparent data point on U.S. munitions consumption rates — one that informs Beijing's own military planning (South China Morning Post, April 23, 2026).
The CSIS report itself delivered a blunt warning: the depletion "will further constrain U.S. forces should a conflict arise in the near term, given insufficient pre-war inventories," adding that "a war against a capable peer competitor like China will consume munitions at greater rates" (CSIS, April 22, 2026). Chinese analysts largely echoed this assessment, arguing that the Iran conflict — fought against a mid-tier adversary with significant but limited ballistic missile capabilities — would pale in intensity compared to a potential Pacific confrontation.
A Race Against the Clock
The broader concern centres on America's defence industrial capacity. Rebuilding depleted stockpiles of complex systems like THAAD interceptors, SM-3s, and JASSMs requires years, not months. Defence contractors face workforce shortages, supply chain constraints, and the challenge of securing rare materials needed for precision guidance systems.
Meanwhile, the Trump administration extended the Iran ceasefire — even as it claimed to have intercepted what officials described as a "gift from China" in Iranian airspace, a claim that has further raised geopolitical tensions between Washington and Beijing. The episode underscores how the Iran theatre and the broader U.S.-China strategic competition remain dangerously intertwined.
For Pentagon planners, the CSIS assessment is a stark reminder that deterrence depends not only on capability on paper, but on the depth of available inventory when conflict actually begins. The Iran war may be over — but the vulnerabilities it exposed are not.
Illustration: Gemini