Pentagon Races to Rebuild Depleted Missile Arsenal After Iran Campaign

The United States military has a problem that no amount of money can solve quickly: it has spent down its missile stockpiles faster than it can rebuild them. Over the course of a campaign against Iran that began in February, American forces launched more than 13,000 strikes, firing roughly 1,500 Patriot air defense missiles alone—precision weapons that cost about $4 million each. The total bill for munitions expended in that conflict approaches $25 billion. Now the Pentagon is racing to replenish what it has used, an effort that will consume years and tens of billions of dollars, and it has exposed a vulnerability that military planners have largely overlooked until very recently.

At Lockheed Martin's production facility in Camden, Arkansas, the company's missile division head Tim Cahill walks through the assembly floor where Patriot missiles take shape. Each one is engineered to intercept an incoming ballistic missile through sheer kinetic force—what defense engineers call a "bullet hitting a bullet" scenario. The weapon vaporizes whatever it strikes. But Lockheed Martin currently manufactures only 750 of these missiles per year, a rate that falls far short of replacing the 1,500 already fired. The company has committed to ramping production to 2,000 annually by adding shifts and automating more of the assembly line, yet even that acceleration masks a deeper constraint: it takes six weeks to assemble a Patriot, but roughly two years to manufacture the 4,000 individual parts that comprise it.

The supply chain is where the real bottleneck emerges. Lockheed Martin depends on somewhere between 500 and 1,000 suppliers to feed its production lines, and many of those suppliers are sole sources for critical components. The rocket motors that power the Patriot missiles are manufactured five miles away by L3Harris, a separate defense contractor operating under strict safety protocols. The solid rocket fuel must be cured in an oven for days or even weeks, a process that cannot be rushed. L3Harris has nearly doubled its motor production and broken ground on a new, more automated facility, but that plant will not be operational for another 16 months. Even then, the company faces scheduling challenges sourcing certain parts—nozzles and cones among them—that have limited suppliers.

Mark Cancian, a senior analyst at the Center for Strategic and International Studies, has compiled estimates of munitions consumption across seven critical weapons systems used against Iran. His assessment carries weight in Pentagon planning circles. He notes that the shortage of high-tech weapons was largely ignored by successive administrations until the war in Ukraine made clear that the United States lacked adequate inventories and surge capacity for a prolonged conflict. The Iran campaign then demonstrated the scale of the problem in real time. When asked whether the U.S. has enough weapons to sustain the current war, Cancian answers yes—but with a crucial caveat. A conflict with China presents an entirely different calculus. The United States might sustain operations for a month, he says, but extending that conflict into months two, three, or four would pose an enormous challenge.

Defense Secretary Pete Hegseth has pushed the defense industrial base to operate on what he calls a "wartime footing," language that Cahill translates as "controlled chaos." The Pentagon is also pursuing a parallel strategy: buying thousands of cheaper, less sophisticated cruise missiles from startups and smaller contractors. CoAspire, a Virginia-based company, is producing a cruise missile for a fraction of the cost of traditional high-end systems—a couple hundred thousand dollars per unit rather than millions. The missile contains just 200 parts, some of them commercial off-the-shelf components, including BBs glued into the nose for ballast. The engine originated in the hobbyist market. CoAspire has contracts worth $400 million and the Pentagon plans to purchase 10,000 of these lower-cost missiles. The logic is straightforward: a sophisticated air defense system can be overwhelmed by quantity, and a thousand cheap missiles might accomplish what a hundred expensive ones cannot.

The financial commitment is staggering. Lockheed Martin alone has signed a $59 billion contract to build high-performance Patriots. The Pentagon's defense budgets have reached record levels in the trillions, though polling suggests a majority of Americans do not support spending at this scale. Cancian estimates that restoring missile inventories to pre-Iran war levels will take one to five years depending on the specific munition. After that, the military will need several additional years to build reserves that war planners would consider adequate for a potential conflict with China. The Pentagon officially denies that munition shortages exist, stating that such claims are false and only embolden adversaries. Yet the urgency with which contractors are expanding capacity, the billions being committed, and the willingness to accept lower-cost alternatives all suggest that the shortage is real and the clock is running.