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