The Washington Post reports:

The U.S. military has depleted much of its inventory of advanced missile-defense interceptors after expending far more high-end munitions defending Israel amid hostilities with Iran than Israeli forces used themselves, according to Defense Department assessments described to The Washington Post.

The imbalance, according to three U.S. officials who spoke on the condition of anonymity to discuss sensitive security matters, underscores the extent to which Washington has shouldered the burden of countering Iranian ballistic missile strikes during Operation Epic Fury, and raises questions about U.S. military readiness and security commitments around the world.

The United States launched more than 200 Terminal High Altitude Area Defense, or THAAD, interceptors in defense of Israel — roughly half of the Pentagon’s total inventory — along with more than 100 Standard Missile-3 and Standard Missile-6 interceptors fired from naval vessels in the eastern Mediterranean, said the U.S. officials, who, like others in this article, spoke on the condition of anonymity to discuss sensitive security matters. By contrast, Israel fired fewer than 100 of its Arrow interceptors and around 90 David’s Sling interceptors, some of which were used against less sophisticated projectiles fired by Iran-backed groups in Yemen and Lebanon.

Military analysts said the data described to The Post offers a rare window into how the United States and Israel work together.

“The numbers are striking,” said Kelly Grieco, a senior fellow at the Stimson Center. “The United States absorbed most of the missile defense mission while Israel conserved its own magazines. Even if the operational logic was sound, the United States is left with roughly 200 THAAD interceptors and a production line that can’t keep pace with demand.”

The shortage of U.S. interceptors has alarmed U.S. allies in Asia, particularly Japan and South Korea, which rely on the United States as a deterrent to potential threats from North Korea and China. “That bill risks coming due in theaters that have nothing to do with Iran,” said Grieco.

U.S. and Israeli officials routinely tout their close cooperation and the strength of Israel’s multilayered air-defense system. But the Defense Department assessments suggest a more lopsided dynamic. [Continue reading…]