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12 March 2026

An expert’s point of view on a current event.

David Petraeus

Recent U.S. and Israeli operations against Iran and the latter’s retaliatory strikes have once again demonstrated the mathematics of modern air defense. Waves of Iranian-designed Shahed-136 drones—crude, slow, and estimated to cost as little as $20,000 apiece—have in a number of exchanges forced the United States and several Gulf partners to expend Patriot and SM-6 interceptors that cost millions of dollars each.

Interception rates have been impressive. A successful shoot-down that requires a high-end interceptor, however, can be a Pyrrhic victory. The defender burns through scarce and expensive munitions while the attacker draws from comparatively large stockpiles of low-cost systems. This is the drone attrition trap. And it is not new.

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