The United States is facing a critical shortfall in its premier ballistic missile interceptors, with Patriot and THAAD stockpiles dwindling to dangerously low levels following sustained combat operations against Iran, according to a sobering new assessment from the Center for Strategic and International Studies (CSIS). The report warns that the depletion poses a significant near- to medium-term risk to U.S. military readiness, particularly in the event of a major confrontation with China in the Western Pacific.
In a report published Monday, the Washington-based think tank highlighted the urgency of the situation, pointing to the Trump administration’s fiscal year 2027 defense budget request of $95 billion, alongside a supplemental war funding appeal of $21 billion, as evidence of the Pentagon’s acute need to replenish its air-defense arsenal.
The CSIS analysis attributes the sharp decline in inventory to the intensive interception operations conducted during the initial phases of the U.S. war with Iran. While the report notes that Iranian launches have been less frequent since the ceasefire compared to the height of hostilities, the recent resumption of exchanges has further strained already-depleted magazines. The relentless pace of defensive operations has forced the military to expend large quantities of interceptor munitions, leaving critical systems running on fumes.
According to the report’s detailed figures, the Patriot missile inventory has suffered a dramatic reduction. Before the war with Iran, the U.S. stockpile stood at 2,330 interceptors. By the time the ceasefire took effect on April 8, that number had plummeted to 1,030. Current estimates place the remaining inventory between just 759 and 827 missiles a precarious margin that defense planners view as insufficient for a prolonged, high-intensity engagement.
The Terminal High Altitude Area Defense (THAAD) system faces a similarly dire predicament. The pre-war stockpile of 452 missiles dropped to an estimated 232–262 by the April ceasefire. As of July 27, following renewed hostilities, the remaining inventory is projected to hover between 234 and 278 missiles.
Beyond the sheer numbers, the CSIS report raises an alarming strategic concern: the lack of viable alternatives. The center explicitly warned that “there are no effective alternatives to the Patriot and THAAD ballistic missile defense systems.” While U.S. Navy vessels equipped with Standard Missiles (SM-3 and SM-6) possess intercept capabilities, the report cautions that these naval assets are typically positioned too far from operational theaters to effectively backfill the defensive gaps left by depleted land-based systems.
The dwindling supplies, the report concludes, could force U.S. commanders and allied forces to take significantly greater risks in future interception operations—a vulnerability that adversaries, particularly China in the Western Pacific, are likely to note and potentially exploit.
Source: Agencies (edited by Al-Manar)