US Munitions Expenditure Trajectory and Defense Industrial Base Production Capacity: Sustainability Assessment of Ongoing Military Operations

Executive Summary

The US munitions industrial base is consuming critical precision stockpiles faster than it can produce them, and the gap will not close before 2029 at the earliest without emergency congressional appropriations that have not yet materialized. Operation Epic Fury against Iran, which struck more than 13,000 targets over 39 days, expended an estimated 3,700 to 4,500 advanced munitions and depleted more than half of prewar THAAD and Patriot inventories, according to CSIS analysis published in May. Production rates as of July 2026 remain far below what is needed: the Pentagon is receiving roughly 15 new Tomahawks and 20 new Patriot missiles per month, with zero THAAD deliveries scheduled for all of 2026. Artillery production compounds the shortfall, with the Army hitting only 36,000 of its 100,000 rounds-per-month target. These two data points, exquisite missiles and basic artillery alike, confirm that the consumption-production gap is structural, not incidental.

• Defense procurement officers and prime contractor positions: Do not treat the Defense Production Act invocation or multiyear contract awards as a signal that the gap is closing in the near term; replenishment timelines from CSIS and the American Enterprise Institute converge on two to five years for most critical systems.
• Risk officers and investors in defense technology startups: The July 10 finding that qualification timelines exceed 18-24 months is now reinforced by a separate constraint: even qualified suppliers face a demand queue that cannot absorb new entrants at full-system production scale before 2027.
• Policy advisers and congressional staff: The American Enterprise Institute's John Ferrari has documented that as of July 2026, not a single replacement-missile dollar has been appropriated by Congress, leaving procurement running on peacetime rhythms against wartime drawdowns.

The US faces a verified multi-year window in which munitions consumption has structurally outpaced domestic production capacity, a condition the administration's procurement actions have begun to address but cannot resolve before a Pacific contingency window opens.

The Stock-Vs.-Flow Failure That Shapes The Entire Replenishment Debate

Trajectory, not just level: The critical error in public assessments of US munitions is conflating the stock question ("do we have enough to fight today?") with the flow question (are we rebuilding faster than we are consuming?). As of July 2026, the answer to the first is provisionally yes for the ongoing Iran theater; the answer to the second is demonstrably no.

CSIS confirmed in its post-ceasefire analysis that US forces struck more than 13,000 targets over 39 days, consuming an estimated 3,700 to 4,500 advanced munitions. Al Majalla's analysis of the same CSIS data found that across four key munitions categories, more than half of prewar inventories were depleted. The initial ceasefire offered a brief respite, but as CNN reported July 12, with Trump declaring the ceasefire "over," stockpiles face new drawdown pressure at the same moment that the replenishment infrastructure is least equipped to respond.

The flow problem has three compounding dimensions. First, production rates for exquisite systems are structurally low by design: the Tomahawk Land Attack Missile takes months to put on contract and years to produce, as War on the Rocks noted in its June 2026 surge-production analysis. Second, the fiscal mechanism for emergency acceleration, supplemental appropriations, has not activated. Third, the physical manufacturing constraint documented by the DoD IG in the Mesquite case demonstrates that spending money does not automatically translate into parts. The Army spent $4.5 billion between February 2022 and September 2025 on 155mm shell production, per the IG report, and arrived at March 2026 producing 36% of its target volume.

This military constraint translates directly into a geopolitical pricing problem. The Washington Post editorial board noted on July 11 that the first 16 days of fighting Iran consumed approximately 40% of the nation's THAAD interceptors, each costing around $15.5 million. Iran's Shahed drones, by contrast, cost between $20,000 and $50,000 per unit, per Reuters estimates cited by Fortune. The asymmetric cost exchange rate, with the US trading million-dollar interceptors for thousand-dollar drones, is what drives the structural argument for the high-low mix; but the high-low mix's volume production doesn't materialize until 2027-2029.

Why The Pentagon's High-Low Strategy Is Structurally Sound But Temporally Mismatched

The Pentagon's acquisition directorate has read the problem correctly. A CSIS industrial base progress report released in early July 2026 confirmed that the FY 2027 defense budget request plans to grow demand for munitions costing under $600,000 per unit from 49% of total requested units to 70% by FY 2031. The Low-Cost Containerized Missiles program, announced May 2026, contracts Anduril, CoAspire, Zone 5 Technologies, and Leidos for 10,000 cruise missiles between 2027 and 2029. RTX has committed to raising Tomahawk annual production to over 1,000, AMRAAM to over 1,900, and SM-6 to over 500 units per year, backed by multiyear procurement authority Congress approved in the FY 2026 appropriations bill, per the CSIS July progress report.

The Lockheed Martin seven-year, up to $35 billion THAAD contract awarded in late June, with an initial $842.9 million tranche, is the most concrete capital commitment in the replenishment architecture, as reported by The Hill on July 15. Separately, RTX received a $4.7 billion deal in April to accelerate Patriot production. These are genuine supply-side investments. The problem is temporal: the Lockheed THAAD contract's first deliveries will reach operational stockpiles in years, not months. RTX's plan to raise Tomahawk production to over 1,000 per year represents roughly 83 per month, five times the current 15-per-month rate, but that ramp requires factory expansion, tooling, and workforce hiring that the July 10 analysis documented as already constrained.

What is not being reported: The administration's public narrative emphasizes contractual commitments and Defense Production Act invocation as evidence of crisis resolution. Both Hegseth and the White House deputy press secretary have publicly disputed stockpile concerns. But CNN's July 12 reporting revealed that internally, munition levels have been a significant concern, with Pentagon officials' public posture explicitly diverging from private assessments. The CSIS and American Enterprise Institute analyses cited in this article were conducted from open-source Pentagon budget materials, not from classified briefings, yet they reach materially different conclusions than official statements. This gap between public reassurance and open-source data is itself a signal worth monitoring.

The broader industrial implications reach beyond procurement. Expanding missile output requires not only final assembly capacity but increased availability of rocket motors, microelectronics, seekers, propulsion systems, explosives, and composite materials, as Army Recognition documented in its analysis of the Ford and GM missile production talks. Solid rocket motors represent a particular chokepoint: Breaking Defense reported in January 2026 that the SRM supply chain faces a pronounced crunch as demand from both missile replenishment and drone programs converges on a limited supplier base. The Exiger supply chain analysis cited by the New York Post in July flagged that the US is "entirely or near-entirely dependent on foreign sources" for key materials and minerals underlying this production base.

The Pacific Window And The Allocation Problem No Contract Solves

The consumption-production gap does not threaten US capacity to fight the current Iran war. It threatens US capacity to fight a second simultaneous or sequential war, and that threat is directional and accelerating. CSIS stated explicitly in its May 2026 analysis that "the United States has enough munitions for any plausible scenario in the Iran war, but the depleted inventories have created a window of vulnerability for a potential Western Pacific conflict." Mark Cancian, its author, told CNN in July that continued strikes at the then-current rate "would reduce stockpiles enough that there would be a new, higher level of risk with the Indo-Pacific."

Short-term gain, long-term cost: The Trump administration's decision to consume exquisite long-range munitions, which were designed and stockpiled specifically for a potential Pacific peer conflict, in an Iran theater where shorter-range, cheaper systems could have sufficed after initial air defense suppression is a documented operational pattern. CSIS noted that as US forces destroyed Iranian air defenses over the course of the campaign, they transitioned to shorter-range munitions, meaning the exquisite consumption was front-loaded in the campaign's opening days. The CSIS post-ceasefire analysis found that in the first four days, Iran fired more than 2,000 drones and 500 ballistic missiles, driving peak interceptor expenditure. That consumption rate cannot be reversed by contract.

The Pacific dimension spills directly into allied defense architectures. Newsweek reported in July 2026 that European allies, already concerned about US security contributions to NATO, now face a situation where US production capacity is fully committed to Iran war replenishment. The Bruegel think tank's Guntram Wolff told Newsweek that "Europe definitely will need to bolster its domestic defense industrial base as the U.S. will use its production capacities for its war in Iran and elsewhere." This European demand pressure on the same production lines, combined with Ukraine's ongoing requirements and Taiwan arms sales suspended by the Navy, creates what amounts to a global queue for a constrained set of production facilities.

The allocation problem is not resolvable by invoking the Defense Production Act, which CSIS's Cancian assessed as "helpful" but predicting "the impact will be small." The DPA can prioritize existing capacity; it cannot create new tooling, SRM production lines, or qualified machining operators on a timeline shorter than 18-24 months. This is precisely the workforce constraint dynamic that the July 10 analysis documented, and it now extends from qualification backlogs to the raw manufacturing floor.

Counterarguments

1. The depletion narrative overstates the Pacific risk because it ignores command and deterrence variables. The strongest counter-case is that CSIS itself acknowledged China "performed poorly in its last war, against Vietnam in 1979," and that "that difference in experience may preserve deterrence until munitions inventories are restored." The Pacific scenario is a choice, not an automatic escalation. China's leadership would need to conclude that the US inventory gap outweighs all other deterrence factors, including nuclear, conventional alliance depth, and political costs. An analyst relying only on the stockpile depletion data would miss this second-order deterrence dynamic and systematically overstate near-term Pacific risk.

2. The 155mm artillery shortfall may be less strategically relevant than the headline number implies. The DoD IG report acknowledged, and CBS News confirmed, that "the demand for artillery has diminished somewhat, since the war in Ukraine has altered its approach and is now more reliant on drone warfare, rather than the trench fighting of a few years ago." If the 155mm round is being partially substituted by drone-delivered munitions in the most relevant conflict scenarios, the gap between 36,000 and 100,000 rounds per month is an industrial management problem rather than a strategic readiness crisis. This possibility is not fully resolved by available open-source evidence, and the assessment should reflect that the 155mm shortfall matters primarily for NATO ground scenarios, not for the Pacific or Iran theaters.

3. The administration's commercial-sector integration strategy, including the reported Ford and GM talks and the Anduril Barracuda contract, may compress the timeline faster than CSIS's budget-document methodology can capture. CSIS's estimates are based on FY 2026 budget delivery schedules, which were set before the Iran campaign, before the DPA invocation, and before the new commercial entrant contracts. Army Recognition's July analysis of the automotive manufacturer talks noted that if Ford and GM agreements materialize, they would represent one of the most significant civilian industrial integrations into defense manufacturing in decades. The CSIS methodology does not model the speed potential of commercial manufacturing expertise applied to standardized missile subsystems, which is a genuine analytical limitation on all projections in this article, including this one.

Expert Integration

Expert Consensus Assessment

The think tank and defense acquisition research community reaches high agreement on the direction of the problem: US munitions consumption has materially outpaced production, and rebuild timelines are measured in years. There is meaningful disagreement on the severity of near-term Pacific risk and on whether the DPA invocation and new contract awards will compress the timeline.

Expert Disagreement Areas

• Rebuild timeline: CSIS's Cancian assessed three or more years for THAAD, Tomahawk, and Patriot; AEI's McCusker assessed two to five years for most systems. These ranges overlap but differ in their lower bound, with implications for when the Pacific vulnerability window closes.
• DPA impact: Cancian called the DPA invocation "helpful" but assessed the impact as "small." Pentagon acquisition officials, including Assistant Secretary Cadenazzi, pointed to the same authority as evidence of structural momentum, framing the issue as one of long-term capacity building rather than near-term crisis.
• Commercial integration speed: Army Recognition, drawing on Army and defense contractor announcements, suggested that automotive manufacturer involvement could be transformative. CSIS's methodology, grounded in budget documents, does not capture this variable.

Systematic-Expert Alignment

Alignment: MIXED

This assessment aligns with expert consensus on the core finding: the consumption-production gap is real and the rebuild window is multi-year. The assessment diverges from the more optimistic institutional framing by treating the absence of supplemental appropriations as a binding constraint rather than a temporary legislative lag, a distinction that AEI's Ferrari made explicitly and that the administration's public communications have not addressed.

Indicators To Watch

The table below maps the specific observable triggers that would require this assessment to be revised. Each indicator is drawn from public data series that can be tracked without classified access.

Near-term watch list: (1) Senate Armed Services Committee markup on the reconciliation supplemental, expected Q3 2026, will reveal whether the $21 billion munitions line survives or is reduced, which is the single largest binary variable in the rebuild timeline model. (2) RTX Q3 2026 earnings call, expected October 2026, will include updated Tomahawk and Patriot production ramp milestones and is the most granular public signal of whether contractual commitments are translating into factory-floor throughput. (3) The DoD IG follow-up status report on the Mesquite facility, which the Inspector General's July report indicated would be revisited, will confirm whether the General Dynamics investment commitment has produced any qualifying parts by the December 2026 target date Army officials cited.

Decision Relevance

Scenario A (~55%): Prolonged partial replenishment, with stockpiles rebuilding at 30-50% of target rate through 2028, while Iran operational tempo stays at low-to-medium intensity. This is the most near-term path, given current production rates, unappropriated supplementals, and resumed but lower-intensity Iran strikes. If you hold positions in legacy prime contractors (Lockheed Martin, RTX, Northrop Grumman), this scenario sustains elevated demand through the decade and supports current valuations on the munitions production backlog. If you advise on defense procurement policy, this scenario calls for redirecting acquisition reform effort toward the SRM sub-supplier bottleneck, which sits two tiers below the primes and is not yet addressed by any announced contract award.

Scenario B (~30%): Congressional supplemental passes at or above $15 billion for munitions, and commercial integration (Ford/GM, Anduril volume) compresses the rebuild timeline to 2027 for lower-cost systems. This scenario is more favorable for defense technology startups already inside the ITAR and AS9100 perimeter, as our July 10 analysis flagged. If you are an investor in defense-adjacent manufacturing, the signal to watch is whether Ford or GM announce a formal teaming agreement with Raytheon or Lockheed, which would validate the commercial integration thesis and open a new class of non-traditional industrial base entrant. If you lack direct exposure, monitor the Low-Cost Containerized Missiles program delivery schedule: first deliveries from Anduril's Barracuda-500M beginning in 2027 would be the observable confirmation of this scenario.

Scenario C (~15%): Iran operational tempo accelerates back toward peak-phase consumption, concurrent with a Pacific crisis, triggering a genuine dual-theater munitions shortage. This scenario was assessed as by CSIS in its May analysis, given the assumption of no concurrent Pacific conflict. Its probability has not materially changed, but the consequences are now higher given the additional drawdown since May. If you are a risk officer at a company with supply-chain exposure to defense-dependent manufacturing in the US, this scenario is the one that drives the tail risk in your model, not the baseline. The specific trigger to watch is whether PLA naval activity near Taiwan increases in frequency within the next six months, which CSIS flagged as a key timing variable in the vulnerability window.

• The core production rate data for Tomahawk, Patriot, and THAAD is derived from CSIS analysis of unclassified Pentagon budget documents rather than from actual inventory reporting, which remains classified. Actual consumption and production rates could differ materially from these estimates, in either direction.
• The Mesquite facility assessment is based on the DoD IG report as of March 2026; the General Dynamics remediation investment announced after that date has not yet been independently verified as producing qualifying parts, meaning the July 2026 155mm production figure of 36,000 rounds may be an improvement over March but cannot be confirmed from open-source data.
• Allied production offsets, including the Germany and Japan Patriot lines and the new Ukraine license, are not captured in CSIS's inventory rebuild models. If Germany's Patriot line produces its first interceptors before the model's assumed timeline, the gap for that system narrows faster than this assessment reflects.
• No open-source evidence is available on the actual remaining US THAAD inventory level post-Operation Epic Fury, nor on the post-ceasefire consumption rate during resumed strikes in July. Both figures are classified. The assessment treats CSIS's "50% depleted from prewar levels" as the working baseline, acknowledging it may understate current depletion.
• The commercial integration scenarios involving Ford and GM remain at the announcement and discussion stage as of this writing. No formal teaming agreement, contract structure, or production commitment has been publicly confirmed, making this a capability with unconfirmed intent, a distinction that materially affects any timeline estimate derived from it.