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The Pentagon is preparing a dramatic course correction after years of purchasing key missile-defense interceptors in relatively modest numbers — even as China built up the world’s largest arsenal of conventional ballistic and cruise missiles and the U.S. increasingly focused on the threat of a conflict in the Indo-Pacific.
Following a string of missile-heavy conflicts, U.S. air defenses have been used repeatedly to protect Israel, American forces in the Middle East and Navy ships in the Red Sea, drawing down some of the Pentagon’s most sophisticated and difficult-to-replace munitions.
The Pentagon’s abrupt course correction raises a question that has taken on new urgency after years of missile-intensive warfare: Why did the U.S. wait so long to build deeper interceptor magazines?
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The Army’s fiscal 2027 budget, reviewed by Fox News Digital, calls for a massive increase in purchases of Patriot Advanced Capability-3 Missile Segment Enhancement (PAC-3 MSE) and Terminal High Altitude Area Defense (THAAD) interceptors, part of a broader effort to rapidly expand a munitions industrial base that cannot be scaled overnight.
The shift is particularly striking when compared with what the military was buying only a few years ago.
The budget documents show PAC-3 MSE procurement at 230 missiles in fiscal 2024 and 214 in fiscal 2025. The same FY2026 budget book shows the Army Requirements Oversight Council had increased its acquisition objective for the missile from 3,376 to 13,773 in April 2025 — more than quadrupling the requirement.
“The problem is 25 years of not buying enough munitions,” retired Rear Adm. Mark Montgomery, a senior fellow at the Foundation for Defense of Democracies, told Fox News Digital.
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PAC-3 MSE and THAAD are among the military’s most important defenses against ballistic missile attacks. Patriot batteries provide shorter-range protection for troops, air bases and other critical assets, while THAAD is designed to intercept ballistic missiles at higher altitudes and greater distances, giving commanders another layer of defense against incoming attacks.
Reuters reported this week that the Army has used “virtually all” of its ATACMS and Precision Strike Missile inventories in just five months of conflict with Iran, while also drawing heavily on Patriot and THAAD interceptors.
The rapid expenditure, coupled with years of relatively modest procurement, raises a broader question: What would happen in a longer conflict against a near-peer adversary like China?
“The shortage was entirely foreseeable, and there have been arguments surrounding interceptor and munition procurement numbers for decades,” Jim Fein, a defense industrial base researcher at the Heritage Foundation, told Fox News Digital. “Ultimately, budgetary tradeoffs were made, and those arguing for other programs won out.
The Pentagon budget documents reviewed by Fox News Digital show years of relatively modest procurement for some of the military’s most important missile-defense interceptors.
Army budget documents show PAC-3 MSE procurement fell from 328 missiles in fiscal 2022 to 252 in fiscal 2023, 230 in fiscal 2024 and 214 in fiscal 2025. The fiscal 2026 request began to move higher, with funding for 320 PAC-3 MSE missiles.
THAAD procurement was even smaller. The Missile Defense Agency bought 11 interceptors in fiscal 2024 and 12 in fiscal 2025. Its fiscal 2026 base request called for 25, while an additional $317 million in mandatory reconciliation funding added 12 more, bringing the total to 37 interceptors.
The procurement history broadly aligns with the findings of a new Heritage Foundation analysis, which estimates annual production capacity at 620 PAC-3 MSE missiles and 96 THAAD interceptors. Much of the difference between U.S. procurement and total production was accounted for by foreign military sales, according to Fein, who authored the report.
Lagging U.S. purchases were the byproduct of decisions made across both the Pentagon and Congress.
“Budget tradeoffs obviously lead to hard choices, and it now looks like many of those past decisions were wrong,” Fein said. “That includes decisions by the Pentagon in what they request, but ultimately what Congress appropriates.”
“The shortage was entirely foreseeable, and there have been arguments surrounding interceptor and munition procurement numbers for decades. Ultimately, budgetary tradeoffs were made, and those arguing for other programs won out.”
By fiscal 2027, the approach had changed dramatically. Responsibility for THAAD procurement had shifted to the Army, and the Army request supports production of 857 THAAD interceptors: 27 through discretionary funding and another 830 through mandatory Munitions Acceleration Council funding.
But ordering thousands more missiles on paper is only the beginning.
The new production plans will require Congress to provide the money and industry to build the additional manufacturing capacity needed to deliver them. Fein called the administration’s new agreements with defense companies “the most significant effort to address munitions shortfall in, at a minimum, decades.”
“The trick will be obtaining the funding needed to turn the framework agreements into actual production,” he said.
Even with the money in place, replenishing U.S. magazines will take time. Advanced interceptors rely on specialized production lines and a network of suppliers producing rocket motors, seekers, guidance systems, energetics and other components that cannot be expanded overnight.
That means the dramatic increase in planned procurement is less an immediate refill of depleted inventories than an attempt to build the industrial capacity needed to sustain much higher production over the coming years.
The stakes extend well beyond the war with Iran, the Heritage report argues.
A conflict with China could place far greater and more sustained demands on U.S. missile defenses, particularly if Beijing struck American bases and forces across the Indo-Pacific with large salvos of ballistic and cruise missiles.
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“Interceptor inventory is not a supporting detail in a China contingency—it is what allows the Joint Force to survive long enough to win,” Fein wrote.
The report estimates the United States would require 7,082 PAC-3 MSE interceptors and 1,394 THAAD interceptors for what it considers a minimum viable inventory in a conflict with China—several times the inventories it estimates the U.S. currently holds. Actual U.S. stockpile levels remain classified.
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At current production rates, Heritage estimates it would take between roughly nine and more than 80 years to build the interceptor inventories it believes are needed, depending on the missile system. “The window of opportunity to bridge the interceptor gap is closing,” Fein wrote.
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