The United States has used “virtually all” of its Army Tactical Missile Systems and newer Precision Strike Missiles during the five-month war with Iran, according to a Reuters investigation citing officials familiar with classified stockpile data.

The precision-guided ATACMS and PrSM weapons, which cost more than $1 million each, allow American forces to strike targets deep inside Iran without sending pilots through heavily defended airspace. Officials did not disclose how many missiles remain, but warned that the shrinking inventory could limit Washington’s options if large-scale strikes resume.

One source also told Reuters that the U.S. has fired slightly less than half of its worldwide Tomahawk cruise-missile inventory since the war began, though Reuters could not independently verify that figure. Tomahawks are launched from U.S. warships and submarines against fortified or heavily defended targets.

The shortage extends beyond offensive weapons. An analysis cited by Reuters estimates that the war has consumed approximately 65% of America’s Patriot interceptors and reduced its THAAD interceptor stockpile by at least 38%, raising concerns about protecting U.S. forces and allies from further Iranian missile attacks.

The Pentagon insists the military retains everything needed to defend American interests, while President Donald Trump said U.S. defense companies are producing munitions at record levels. Still, officials reportedly fear the drawdown could weaken American readiness for another major confrontation, particularly against China or Russia, as manufacturers race to rebuild inventories.