The Missile Lesson the West Can’t Ignore: A new form of warfare is emerging—one where quantity and cost may matter as much as technological sophistication.

For decades, Western military doctrine has rested on a comforting assumption: technological superiority would guarantee dominance on the battlefield. Advanced missile defenses, integrated sensor networks, and sophisticated command systems were supposed to create something close to an impenetrable shield over the world’s most developed nations. The ongoing confrontation between Israel and Iran is beginning to challenge that assumption. Israel fields one of the most advanced missile defense architectures ever constructed. Its layered system — including Iron Dome, David’s Sling, and the Arrow interceptors — was designed to counter a wide spectrum of threats, from short-range rockets to long-range ballistic missiles....