Geostrategic Media Political Commentary, Analysis, Security, Defense
Melanie Smith
The United States can launch a missile in minutes. Replacing it may take years. That gap between the speed of modern warfare and the slower pace of industrial production is emerging as one of the most consequential strategic lessons of the war with Iran. The conflict has consumed significant quantities of advanced American munitions, placing renewed pressure on the Pentagon’s ability to replenish its stocks while maintaining commitments to allies in Europe, the Middle East, and the Indo-Pacific.
The central question is not simply how many missiles Washington has fired. It is whether the United States can sustain a prolonged conflict in one region without weakening its ability to deter an adversary in another. In an era of simultaneous security crises, military strength depends not only on the sophistication of a weapon or the size of a defence budget, but also on the capacity to replace what war consumes.
The implications extend well beyond the immediate conflict. If replenishment takes years, American planners must confront difficult choices about weapons allocation, allied deliveries, production priorities, and the credibility of deterrence in the Western Pacific. China will be watching not only the performance of American weapons, but also the resilience of the industrial system that supplies them.
The Cost of a High-Intensity War
The scale of American munitions expenditure is difficult to establish precisely because the Pentagon has not publicly disclosed complete inventories. Estimates vary according to the missile variant, the period covered, and the assumptions used to calculate prewar stocks. Nevertheless, figures cited by the Center for Strategic and International Studies suggest that the campaign against Iran placed substantial demands on several critical weapons systems.
During the 39-day campaign preceding the April ceasefire, US forces reportedly expended between 1,060 and 1,430 Patriot interceptors, representing approximately 45 to 61 percent of an estimated prewar inventory of 2,330. They also used an estimated 190 to 290 Terminal High Altitude Area Defense, or THAAD, interceptors, against a prewar stock of roughly 360. Other systems reportedly experienced significant expenditure, including the Precision Strike Missile and Tomahawk cruise missile.
These figures should be treated as estimates, not a definitive accounting of the American arsenal. Yet the strategic concern does not depend on a single inventory calculation. The reported scale of expenditure raises questions about the time and industrial capacity required to restore stocks to levels suitable for another major contingency.
Not all missiles are interchangeable. An abundance of one weapon cannot compensate for a shortage of another designed for a different mission. Air and missile defence interceptors, long-range cruise missiles, and precision-strike weapons serve distinct operational purposes. A military may retain considerable firepower in aggregate while facing shortages in the particular systems needed to defend bases, protect allied territory, or strike heavily defended targets.
US officials have publicly played down concerns about shortages while acknowledging that replenishment timelines vary considerably. Some munitions may take months to replace; others may require years. Estimates cited in the source material suggest that returning certain inventories to prewar levels could take three years or more. Even then, restoring the previous baseline would not necessarily produce the depth of reserves required for a prolonged conflict with a major power.
The war has therefore exposed a difficult distinction between the ability to conduct an operation and the ability to sustain one. American forces may possess a formidable technological advantage, but that advantage becomes harder to maintain when expenditure outpaces the production system’s ability to replenish supplies.
The Industrial Bottleneck
The United States did not build its current defence-industrial structure for an indefinite sequence of large-scale wars. After the Cold War, defence consolidation, reduced procurement orders, and a shift toward smaller production runs weakened the economic incentives for manufacturers to maintain extensive spare capacity. Contractors retained advanced engineering expertise, but the facilities, skilled labour, specialized components, and supplier networks required for rapid expansion cannot be created overnight.
This is the difference between ordering more weapons and producing them at scale.
Manufacturing a modern missile involves far more than assembling its visible components. Motors, guidance systems, electronics, specialized materials, testing facilities, and qualified suppliers all have to be available in sufficient quantities. A shortage at any stage can constrain the output of an entire production line. Expanding capacity may require new facilities, additional workers, equipment, regulatory approvals, and extensive testing before production can begin.
Long-term contracts can provide manufacturers with the certainty needed to invest. But contracts do not automatically accelerate deliveries. A factory cannot immediately fulfil a new order if its production line is already committed, its suppliers are operating at capacity, or its workforce requires years of specialized training.
Companies such as RTX, through its Raytheon business, and Lockheed Martin occupy important positions in the American missile industry. Their ability to increase output depends not only on their own investment decisions but also on the capacity of the wider industrial network. The same constraints affect subcontractors that produce essential components and support systems.
The timing of procurement matters, too. Additional funding requested for future fiscal years cannot retroactively produce missiles that are needed today. Manufacturers must work through existing orders, secure components, and expand production before new appropriations translate into delivered weapons. Even an aggressive industrial mobilization may take years to make a substantial difference.
This creates a strategic mismatch. Military operations can consume expensive precision weapons at a rate that peacetime production systems were never designed to sustain. Once inventories decline, replenishment becomes a competition between operational requirements, future contingencies, and commitments already made to allies.
Allies Will Feel the Pressure
The consequences are unlikely to stop at America’s borders. US allies depend on American weapons both to strengthen their own defences and to complement the capabilities of US forces. If Washington must prioritize replenishing its inventories, foreign deliveries could face delays or tighter allocation.
Such pressures would be especially consequential for countries relying on American missile-defence systems to protect military facilities, critical infrastructure, and population centres. They could also affect partners seeking long-range precision weapons as part of broader efforts to deter regional adversaries.
The result may be a period of difficult strategic bargaining. Washington will have to decide which orders take priority, how much capacity to reserve for its own forces, and how to balance immediate operational demands against longer-term alliance commitments. Even if the United States ultimately fulfils its obligations, delays could complicate allied planning and encourage governments to reconsider the risks of relying too heavily on a single supplier.
This is not an argument that American alliances are about to collapse. It is a reminder that security commitments depend on material capabilities as well as political assurances. An ally that expects a particular weapon system at a particular time cannot treat a production backlog as a minor administrative inconvenience. Its own deterrence planning may depend on that delivery.
Europe has already encountered related difficulties since Russia’s full-scale invasion of Ukraine in 2022. Governments increased defence spending, ordered additional ammunition, and supplied weapons to Kyiv, only to discover that expanding production was more complicated than announcing new targets. European initiatives to increase ammunition manufacturing helped focus attention on the problem, but projected capacity is not the same as actual output, and output is not the same as delivery to the battlefield.
The distinction matters. A factory may have the theoretical capacity to produce a specified quantity of ammunition, yet fall short because of supply constraints, labour shortages, delayed investment, or competing orders. New facilities and converted production lines also require time to become fully operational.
The same caution applies when comparing Western and Russian ammunition production. Estimates often combine different calibres or categories, making simple comparisons misleading. Russia’s wartime production has been shaped by sustained demand and a military economy operating under the pressures of a prolonged conflict. Western countries, by contrast, are attempting to expand production after decades in which procurement was not consistently calibrated for a major, extended war.
The broader lesson is that defence spending does not translate immediately into battlefield capacity. Governments must build the industrial foundations before a crisis, not merely finance expansion after stocks have been depleted.
The Western Pacific Is the Strategic Test
The most consequential question concerns China. A potential conflict in the Western Pacific would place demands on several of the same broad categories of weapons used in the war with Iran, including long-range cruise missiles and advanced air and missile defence interceptors. American forces would also require a wider range of naval, air, and land-based capabilities tailored to the geography and operational demands of a conflict in East Asia.
The overlap does not mean that every missile used in the Middle East would necessarily be required in identical quantities in a conflict with China. The two theatres differ in geography, military objectives, force structure, and the types of operations likely to be conducted. But they would compete, at least in part, for the same industrial resources, skilled labour, and production capacity.
That is where the depletion of American stocks becomes a problem of global strategy. Washington must prepare for contingencies that may occur far apart geographically but depend on overlapping supply chains. If one conflict consumes large numbers of critical weapons, the Pentagon may have fewer options available for responding quickly to another crisis.
China’s military capabilities make the issue particularly important. Its extensive missile forces and increasingly sophisticated air defences would pose serious challenges to US operations. A conflict in the Western Pacific could require sustained expenditure of precision weapons and defensive interceptors, potentially placing extraordinary demands on American inventories and manufacturing capacity.
Deterrence depends in part on convincing an adversary that the United States can impose unacceptable costs and sustain operations long enough to achieve its objectives. If American inventories are constrained, or if the time required to replenish them becomes a central limitation, military planners must account for that vulnerability. The concern is not that China would automatically interpret depleted stocks as an opportunity for aggression. It is that uncertainty about American endurance could complicate calculations on both sides.
A military can possess superior weapons and still face a difficult strategic position if it cannot replace them at the necessary pace. The ability to sustain operations may prove as important as the ability to win the opening phase of a conflict.
Rebuilding the Arsenal Requires a Long-Term Strategy
The immediate response must begin with a clearer understanding of the problem. The Pentagon needs reliable assessments of inventory levels, operational requirements, production bottlenecks, and the time required to restore essential reserves. Public estimates can illuminate the scale of the challenge, but strategic decisions require detailed information about individual systems rather than aggregate missile totals.
The next task is to expand production in ways that deliver measurable results. That means providing predictable multiyear contracts, investing in critical suppliers, strengthening the workforce, and addressing bottlenecks in motors, guidance systems, electronics, and testing. Where feasible, standardizing components and improving manufacturing processes could also make production more flexible. But such measures must be judged by actual delivery schedules, not announcements of planned capacity.
Washington should also coordinate more closely with its allies. Joint procurement, shared investment in manufacturing, and better visibility into delivery schedules could reduce unnecessary competition for limited supplies. Allies, in turn, have an incentive to diversify their industrial bases and strengthen their own capacity where economically and technologically feasible. Greater self-reliance would not replace the American security role, but it could make allied defence arrangements more resilient.
Finally, the United States must connect military operations to an honest assessment of industrial endurance. Decisions about the use of scarce munitions should reflect not only their immediate battlefield value but also the demands of other contingencies. This does not mean withholding weapons whenever inventories fall. It means recognizing that every major operation has implications for readiness elsewhere.
The war with Iran has highlighted a vulnerability that cannot be solved by a single emergency appropriation. It requires sustained investment, credible planning, and a willingness to treat the defence-industrial base as a central component of national security rather than a support function that can be expanded at will.
The United States remains a formidable military power. But power is not measured solely by the weapons already in its arsenal. It also depends on the capacity to replace them, sustain allies, and prepare for the conflicts that may follow. In a world of competing theatres and increasingly demanding military operations, the ability to manufacture weapons at scale is no longer simply an industrial concern. It is a measure of strategic endurance.
The decisive question is whether Washington can rebuild that endurance before another crisis tests it.
