US military air defense stockpiles depleted by recent Iran conflict, analysis finds

A Center for Strategic and International Studies analysis reveals that recent fighting with Iran has depleted U.S. Patriot and THAAD interceptor stockpiles by up to 65% and 38% respectively. While the Pentagon maintains it has sufficient capabilities, military officials warn the shortage could impact operations and force riskier defense strategies. The conflict has cost $37.5 billion, prompting a $67 billion replenishment request amid rising political tensions ahead of the November 2026 midterms.

US air defense interceptor depletion

• ▪The Center for Strategic and International Studies estimated that the U.S. Patriot interceptor stockpile fell from 2,330 before the war to between 759 and 827 after recent fighting in July 2026.

Iran conflict military operations

• ▪An Iranian drone controlled detonation in Iraq on July 18, 2026, killed one U.S. soldier, bringing the total conflict toll to 18 U.S. service members.
• ▪An Iranian missile and drone attack on a military base in Jordan on July 17, 2026, killed three U.S. troops.
• ▪The U.S. military intercepted multiple ballistic missiles from Iran during an attempted surprise attack on U.S. forces in the Middle East on July 28, 2026.

Stockpile impact on military strategy

• ▪Shrunken inventories of Patriot and THAAD interceptors may force the U.S. military to launch fewer interceptors against incoming drones and missiles to conserve air defenses.
• ▪General Dan Caine, chairman of the Joint Chiefs of Staff, advised President Donald Trump that the state of the country's munitions stockpile could impact military operations in Iran.
• ▪Pentagon spokesman Sean Parnell stated that the U.S. military possesses a deep arsenal of capabilities and has everything needed to execute operations.

Pentagon budget replenishment request

• ▪The Pentagon requested $67 billion from Congress to replenish the military, including funding for Patriot and THAAD interceptors.
• ▪Defense Secretary Pete Hegseth estimated that the war with Iran has cost approximately $37.5 billion as of late July 2026.

Political concerns over war costs

• ▪Democrats in Congress have cited the depletion of finite advanced weapons stockpiles as a metric against the ongoing war with Iran.
• ▪The war with Iran, launched by President Donald Trump alongside Israel on February 28, 2026, without congressional approval, has posed political challenges for Republicans ahead of the November 2026 midterm elections.

Future China conflict preparedness

• ▪The Center for Strategic and International Studies warned in May 2026 that replenishing stockpiles of Patriots, THAADs, and Tomahawk cruise missiles could take at least three years.
• ▪Depleted air defense stockpiles have raised concerns that the U.S. military would have diminished firepower in a potential future conflict with China.

1 source