A new analysis by the Center for Strategic and International Studies (CSIS) warns U.S. missile defense inventories are dangerously low, with extensive combat operations depleting key interceptor stockpiles.
Drawing on Pentagon Fiscal Year 2027 budget documents and other defense data, the CSIS report concludes that the current inventory of Patriot interceptors has fallen below the 1,000-unit mark. Meanwhile, stockpiles of the Terminal High Altitude Area Defense (THAAD) interceptors have dropped to approximately 250.
The report, titled "Renewed Iran War Would Test Diminished Interceptor Inventories," highlights the heavy toll that recent air defense campaigns have taken on U.S. and coalition munitions. While defensive efforts have been largely successful in maintaining high interception rates against incoming ballistic threats, the extensive expenditure of these advanced systems has left military inventories dangerously low.
According to CSIS analysts, these diminished stockpiles could force the United States and its coalition partners to take greater strategic risks during future interception operations. The report notes that there are currently no viable alternatives to the Patriot and THAAD systems for effective ballistic missile defense, as Navy ships equipped with Standard Missiles are generally stationed too far away to provide immediate and reliable coverage.
To address this urgent shortfall, the FY 2027 defense budget proposal reflects a significant push to rebuild the arsenal. The administration's budget request includes a massive 95 billion U.S. dollars' allocation specifically for munitions, along with an additional 21 billion dollars in war supplemental request.
CSIS warns US missile defense stockpiles dangerously low
