The Trump administration has indicated that some of the largest waves of military strikes against Iran are still expected in the coming days. At the same time, the president has expressed strong confidence in America’s ability to sustain the campaign.
In remarks posted to his Truth Social platform on Tuesday, Trump said the United States possesses ample weapons reserves, describing the country’s stockpile of medium and upper medium grade munitions as “virtually unlimited.”
The president wrote that American stockpiles “have never been higher or better,” and argued that such supplies could support sustained operations if necessary.
“Wars can be fought ‘forever,’ and very successfully, using just these supplies,” Trump wrote, adding that the weapons are superior to those possessed by other nations. Trump also noted that while the U.S. has a solid supply of its most advanced weapons systems, additional high-grade weaponry is stored in allied locations overseas.
Despite that confidence, some defense analysts say extended combat could put pressure on certain specialized weapons systems.
Joe Costa, director of the Forward Defense program at the Atlantic Council, said the U.S. military is currently expending a significant number of high-tech munitions and interceptors during operations tied to the conflict.
Those systems include Terminal High Altitude Area Defense interceptors, Patriot missile systems, the Advanced Medium-Range Air-to-Air Missile, and several types of ship-launched missiles such as the SM-2, SM-3 and SM-6.
Costa, who previously served as a principal civilian adviser to Pentagon leadership on operational war planning and overseas force posture, said the pace of these expenditures could become concerning if sustained for long periods.
“I think it is very concerning in terms of the strain that this could put on our interceptor capacity if we maintain this sustained tempo over time,” Costa said.
While precise projections are difficult without complete information, Costa suggested that supply concerns could begin emerging within weeks if the operational tempo remains high.
“Timelines are difficult without perfect information, but you’re talking weeks, not months,” he said.
Concerns about missile stockpiles are not entirely new. The United States has yet to fully replenish certain high-end interceptors, including THAAD missiles, after the military used roughly 25 percent of its inventory in only a few days of operations against Iran in June 2025.
Those interceptors are considered critical for defending U.S. personnel and installations against Iranian ballistic missile threats.
Patriot and THAAD systems have also been heavily used in other regional operations. Patriot missiles continue to be requested by Ukraine in its war with Russia, while U.S. naval forces have used SM-series missiles to protect ships in the Red Sea from attacks by the Houthis, an Iranian-backed group in Yemen, and to defend Israel from Iranian missile strikes.
Because of the advanced technology involved, these weapons are difficult to produce quickly. Each replacement interceptor can take two years or more to manufacture, and the United States currently produces only several hundred THAAD and Patriot missiles annually.
Joel Rayburn, a senior fellow at the Hudson Institute’s Center for Peace and Security in the Middle East, said the production limits mean the inventory expended during last year’s operations likely has not yet been fully replenished.
“Our production line is small enough that those won’t have been fully replenished since then,” Rayburn said.
Even so, Rayburn expressed a more optimistic outlook about the broader military balance between the United States and Iran.
“I think the missile math favors us,” he said, noting that Iran’s own supply of missiles is limited.
Rayburn argued that Iran faces additional constraints because its airspace has already been compromised during the conflict.
“The Iranian regime has already lost control of its airspace,” he said. “They’re not going to be spending, procuring or producing anything, because they’re under enemy fire. So whatever they have is what they’re going to expend.”
Still, Rayburn cautioned that large-scale use of advanced munitions could have implications for America’s long-term preparedness.
“Strategically beyond this conflict, it’s an issue for us,” he said, noting that future military contingencies could require those same limited weapons.
The Pentagon has previously acknowledged the strain on its arsenal. Last year the department requested nearly $30 billion from Congress to replenish high-end missile systems and interceptors, though the request was only partially funded in the defense budget approved last month.
Costa said reducing the rate at which interceptors are used will depend heavily on eliminating Iranian launchers and missile systems before they can be fired.
“It’s a numbers game,” he said, explaining that destroying launch platforms would reduce the need to intercept incoming threats.
The battlefield also presents challenges beyond ballistic missiles. Low-cost drone attacks have increasingly become a concern because they can force defenders to expend expensive interceptors.
Such attacks can overwhelm defenses and threaten bases, ports, and infrastructure when defensive systems become saturated. A drone attack was responsible for the deaths of six U.S. service members in Kuwait on Sunday.
Uncertainty about how long the conflict will last adds another layer of difficulty for military planners.
Trump has said the operation was expected to last four to five weeks but acknowledged it could go “far longer.”
Defense Secretary Pete Hegseth said Monday that the timeline could shift depending on developments in the conflict.
“He has all the latitude in the world to talk about how long it may or may not take — four weeks, two weeks, six weeks,” Hegseth said.
Vice President JD Vance has also outlined the administration’s objectives in the campaign, saying the U.S. will continue operations until Iranian offensive missiles and missile production are destroyed, Iran’s navy is neutralized, and Tehran is prevented from obtaining a nuclear weapon.
Prior to launching the operation, senior military officials reportedly warned that existing weapons stockpiles could present challenges in the event of a prolonged conflict.
Joint Chiefs of Staff Chairman Gen. Dan Caine raised those concerns during a White House meeting last month, warning that ongoing support for Israel and Ukraine had already reduced certain inventories.
The issue has also drawn attention from lawmakers.
Sen. Tim Sheehy (R-Mont.) said after a classified Senate briefing that while he does not have immediate tactical concerns, the broader strategic picture deserves attention.
“Not tactically,” Sheehy said. “On a strategic scale, absolutely.”
He added that expanding America’s munitions production capacity should become a priority.
Democratic Sen. Tim Kaine of Virginia likewise acknowledged the issue, saying officials are monitoring both offensive and defensive weapons supplies.
“It’s a real issue that we have to pay attention to munitions,” Kaine said.
Costa noted that previous administrations had weighed similar concerns when deciding whether to engage Iran militarily, fearing that major operations could stretch resources needed for other potential global crises.
“That’s why previous administrations have said it’s not worth it,” he said. “[The Trump administration] made a decision to say it’s worth it, and we’re banking on no other action to happen in the world.”
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