Iran war depleted US Patriot missile stockpiles, creating readiness challenges, experts say
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- CSIS estimates the US expended about 65% of its pre-war Patriot interceptor inventory, leaving fewer than 1,000 interceptors available for future operations.
- THAAD interceptor inventories declined by roughly 38%, leaving an estimated 234 to 278 interceptors remaining.
- CSIS identified the greater strategic risk as responding to another high-intensity conflict before stockpiles can be rebuilt, a process that analysts say takes multiple years.
- CSIS analysts Mark Cancian and Chris Park wrote that "There are no good alternatives to Patriot and THAAD for ballistic missile defense," stressing the lack of substitutes.
- The Army awarded Lockheed Martin a contract worth up to $58.6 billion to produce PAC-3 MSE interceptors through fiscal 2032, though Cancian noted missiles funded today won't arrive for three to five years.
- The Pentagon has not publicly confirmed the inventory estimates in the CSIS analysis and did not immediately respond to a request for comment.
Why it matters: With fewer than 1,000 Patriot interceptors remaining, the US faces a near- to medium-term window in which it cannot simultaneously sustain current operations and respond to a new high-intensity contingency without accepting greater operational risk. The Army's $58.6 billion Lockheed Martin contract won't deliver new interceptors until at least 2028-2030, given the 3-5 year production timeline, leaving allied air defense exposed until then.
