U.S. Munitions Stockpiles Strained by Iran Conflict, Production Ramps Up

The ongoing conflict involving Iran and its proxies has significantly impacted U.S. Munitions stockpiles, raising concerns about the nation’s ability to respond to potential future crises, particularly in East Asia. While the United States maintains substantial overall capacity, the repeated use of precision-guided munitions and interceptors has created risks, prompting the Trump administration to prioritize increased production. This situation echoes previous shortages experienced following the Russian invasion of Ukraine, leading to renewed calls for bolstering the munitions industrial base.

The Roots of the Shortfall

The current predicament isn’t due to a single cause, but rather a long-term pattern of underfunding and inconsistent procurement strategies. For years, munitions programs have faced fluctuating budgets, with funding often diverted to address shortfalls in other defense priorities. Between Fiscal Year 2001 and FY2021, funding for 80 missile and munitions programs varied by more than 50% annually, creating instability for both program managers, and manufacturers.

Efforts to rebuild magazine depth following the Ukraine conflict have shown some progress, but haven’t fully addressed the underlying issues. In late 2023, the U.S. Army awarded nine production contracts for 155mm artillery shells, aiming for a monthly output of 100,000 by August 2025, but production has fallen short due to supply chain bottlenecks and performance challenges.

The cyclical nature of munitions purchases as well hinders sustained production capacity. Companies can only invest in facilities and workforce development based on existing contracts, making it demanding to maintain a consistent cost profile and workforce when procurement fluctuates. For example, procurement of Joint Direct Attack Munitions (JDAMs) saw significant drops in the FY2023 to 2025 budgets.

Precision Munitions: A Weapon of Choice

The frequent use of precision-guided munitions by the Trump administration – in Yemen, Venezuela, and during Operation Epic Fury – highlights their appeal as a foreign policy tool. Their destructive power, limited risk to American forces, and precision in minimizing collateral damage make them a preferred option.

Beyond Depth: The Need for Breadth

While increasing magazine depth – the quantity of existing munitions – is crucial, it’s not sufficient. The U.S. Also needs to expand the breadth of its munitions capabilities by developing more affordable, rapidly producible systems and diversifying sourcing options. The use of inexpensive drones by adversaries, attempting to overwhelm expensive systems like Patriot missiles, underscores this need.

Recent initiatives demonstrate a shift towards this approach. The introduction of the Low-Cost Unmanned Combat Attack System (FLM 136), reverse-engineered from Iranian Shahed-136 drones, exemplifies this trend. The Department of Defense’s Drone Dominance Program is also prioritizing the rapid fielding of low-cost, one-way attack drones.

The Air Force is focusing on manufacturing producibility through programs like the Family of Affordable Mass Munitions, aiming to develop cruise missiles with significantly lower unit costs. Efforts to co-produce munitions with allies, such as Poland’s agreement to produce Patriot missile launchers, and to encourage second sourcing are also underway.

Ongoing Efforts and Challenges

Deputy Secretary of Defense Steve Feinberg formed the Munitions Acceleration Council in 2025 to ramp up production of 12 key systems, including Patriot interceptors and Long-Range Anti-Ship Missiles. This led to framework agreements with Lockheed Martin, Raytheon, and L3Harris to increase production capacity. For example, the Lockheed deal aims to increase PAC-3 Missile Segment Enhancement interceptor production from 600 to 2,000 annually.

But, these framework agreements require matching Congressional appropriations. The FY2026 reconciliation law included over $25 billion for munitions, but Congress acknowledges that this is still less than the Pentagon requested. Many planned production increases haven’t yet been submitted to Congress for funding.

Looking Ahead

Addressing the challenges facing the U.S. Munitions industrial base requires sustained attention and investment. This includes fulfilling funding commitments, prioritizing low-cost systems and producibility, and expanding sourcing options. A balanced approach, combining increased magazine depth with greater magazine breadth, will be essential for ensuring the long-term resilience of the U.S. Defense industrial base.