The United States has used large quantities of advanced missiles and interceptors during its military campaign against Iran, according to multiple US officials and new strategic assessments, raising internal concerns that a prolonged withdrawal could complicate Washington’s ability to quickly respond to a future crisis involving China and Taiwan.This issue has emerged as one of the most consequential hidden costs of the Iran conflict. While the US military retains tremendous global power and officials insist that readiness remains intact, analysts have warned that it could take years to rebuild depleted missile stockpiles in the Middle East, leading to what some describe as a temporary weakness in the Indo-Pacific.The center of concern is not military strength or aircraft numbers, but munitions. Modern warfare is increasingly determined by access to accurate missiles, interceptors, and industrial production capacity. The battlefield advantages of a navy without adequate air-defense interceptors or an air force lacking long-range strike weapons could quickly diminish.
Which America has used in Iran war
Since the conflict with Iran began on February 28, the US has reportedly fired more than 1,000 Tomahawk cruise missiles and 1,500 to 2,000 major air-defense interceptors, including THAAD, Patriot and Standard missile systems, according to US officials quoted in Washington.They are among America’s most advanced and strategically valuable weapons. These are used not only in Middle East operations, but also by the Pentagon in planning any major conflict with China.Replacing such stores is not immediate. Officials say it could take up to six years to completely rebuild some stockpiles, depending on the system, industrial capacity and congressional funding.This has sparked discussion within the administration about whether adjustments might be needed to operational plans for Taiwan and the Western Pacific if emergencies arise in the near term.
Why does Taiwan matter in this debate?
US defense planners have long considered a potential China–Taiwan conflict one of the most demanding military scenarios the US could face.According to recent Pentagon assessments, China has a rapidly growing military, including naval forces, missile systems, drones and more than 600 nuclear weapons. Any war on Taiwan would require vast quantities of long-range missiles, naval interceptors, and air-defense systems.In such a scenario, many of the weapons now in use against Iran would be necessary.Strategists say this creates a key dilemma: Every missile fired in one theater is unavailable in another until replaced.The US intelligence community reportedly assessed in March that Beijing was unlikely to launch a war over Taiwan in 2027 and that there was no firm timeline for unification, although China still wants sovereign control over the island until 2049.There is no sign of impending conflict. But defense planning is based on intent as well as capability.
White House dismisses readiness concerns
Senior Trump administration officials have strongly rejected claims that the Iran war has weakened US preparedness.White House press secretary Carolyn Leavitt said: “The entire premise of this story is false.”He said: “The United States has the most powerful military in the world, loaded with more than enough weapons and munitions at home and around the world to effectively defend the homeland and achieve any military operation directed by the Commander in Chief.”Sean Parnell, the Pentagon’s chief spokesman, also dismissed suggestions of de-escalation, saying the military “has everything necessary to execute at the time and place the President chooses.”Officials further argue that production can be ramped up through investment, procurement reforms and expanded manufacturing.
Pacific commander says no immediate costs
Admiral Samuel Paparo, who would oversee any major Pacific war, told lawmakers this week that ongoing operations in the Middle East are also giving the U.S. military valuable combat experience.“For now,” Paparo told the Senate Armed Services Committee, “I don’t think any real costs will be imposed on our ability to deter China.”This approach reflects the Pentagon’s public confidence that the current inventory remains adequate.However, analysts say that what is sufficient for deterrence today is far from ideal for a protracted multi-theater war tomorrow.
CSIS alert: year to rebuild stocks
A new report from the Center for Strategic and International Studies has expressed concern over dwindling reserves.Based on pre-war estimates, the think tank said the amount of weapons used in an Iran war could be:
- About 27% of Tomahawk reserves
- About 36% of JASSM long-range missiles
- About a third of the SM-6 missiles
- About half of the SM-3 interceptors
- More than two-thirds of Patriot Interceptors
- More than 80% THAAD interceptors
This means that the greatest pressure may be on defensive systems rather than offensive attack weapons.Mark Cancian, senior adviser at CSIS, said: “It will take us many years to rebuild those inventories.”The report also warned that high expenditure rates had created “a window of increasing vulnerability in the Western Pacific”.
Why does missile defense matter most?
Most public attention is focused on aircraft carriers or stealth bombers, but wars are often constrained by missile availability.A destroyer without interceptors is exposed. The value of a Patriot battery without reloading is limited. Fighters without stand-off missiles must fly close to the threat.This is particularly important in any Pacific conflict, where China’s military doctrine emphasizes anti-access and area denial. This strategy relies on missiles designed to keep American ships and aircraft at a distance.To counter this, the US would need a large number of interceptors and precision weapons.Kelly Grieco of the Stimson Center said: “The United States will have to fight China in a way that is potentially much more costly and dangerous for the U.S. military.”“You’re going to get more erosion.”
Pentagon response: Build more, faster
The Pentagon is now moving to increase production and replenish stocks. The White House has reportedly asked Congress to approve $350 billion for critical weapons in the fiscal year 2027 budget. Defense companies RTX and Lockheed Martin have signed agreements to rapidly ramp up production.Lockheed said it will quadruple production of THAAD and PAC-3 Patriot interceptors. RTX said it will accelerate deliveries of Tomahawks, AMRAAM air-to-air missiles and standard missile variants.The Pentagon has also contacted American automakers and industrial manufacturers for help increasing wartime production capacity.US Defense Secretary Pete Hegseth said last year: “Our objective is simple: to transform the entire acquisition system to operate on a war footing.”
Trump says arsenal still deep
President Donald Trump has dismissed concerns over supply constraints and recently claimed that the US maintains a “virtually unlimited supply of intermediate and upper intermediate grade munitions”.At the same time, he has warned that the bombing campaign against Iran could resume if Tehran refuses to reach an agreement on its nuclear program.This creates a strategic paradox for Washington. America may continue attacking Iran in the near future. But each additional week of conflict consumes premium missiles needed for deterrence elsewhere.
