The US war with Iran has cost $38bn and exposed bottlenecks in replacing advanced munitions

Seven months of war with Iran have cost the United States about $38bn, according to assessments by the Pentagon inspector general and Congressional Budget Office reviewed by the Financial Times. The CBO estimates that continued operations could add $2bn–$3bn every month. The White House is seeking $67bn in emergency Pentagon funding, including $21bn to replace munitions.

Money cannot immediately solve the shortage. Production is constrained by solid rocket motors, high-grade explosives, specialized components and trained workers. Those supply chains take years to expand, so consumption in one theatre reduces the margin available for other contingencies even when replacement orders are fully funded.

Iranian strikes have also imposed costs that public rhetoric tends to obscure. The inspector general counted 22 destroyed US aircraft, including fighters and drones, damage to hundreds of buildings at bases across the region, and about $184mn in damage to diplomatic facilities. Damage around Bahrain has pushed some naval operations toward more distant Diego Garcia, increasing logistical burdens.

The administration disputes descriptions of a shortage. The reports nevertheless distinguish inventory from readiness: the United States can continue fighting, but at a tempo that reveals how slowly its industrial base can replenish certain weapons. That constraint matters well beyond this war.