On September 17, 2025, Israel announced that the world’s first laser defense system was ready for deployment, and was being integrated into its multitiered missile-defense shield. Iron Beam may be the most significant advance in missile defense since Israel pioneered the concept of intercepting missiles with missiles back in the 1980s.

That’s because Iron Beam promises to solve one of modern warfare’s most vexing problems: the economic asymmetry of defense. When a crude, unguided rocket costing a few thousand dollars must be stopped with an interceptor costing between $50,000 and $100,000, the math quickly becomes unsustainable. The scale of rocket, drone, and missile fire into Israel over the last two years, coupled with the yet-unlaunched arsenals that Iran and her proxies have in reserve, would, if each one needed to be defended by traditional interceptors, cripple Israel’s economy. But Iron Beam changes that calculus entirely.

Rather than the $40,000–$50,000 interceptor, each laser interception costs roughly two dollars—the price of the electricity that powers it. The system has what military officials call an “endless magazine,” capable of firing continuously as long as it has power. It’s already battle-tested, shooting down over 40 drones from Lebanon during recent conflicts.

But this breakthrough also raises profound questions. Israel’s intelligence failures on October 7, 2025 partly stemmed from an overreliance on technological solutions—the belief that smart fences and surveillance systems could replace human judgment and offensive action. As Israel celebrates this remarkable achievement of military innovation, how do we ensure Iron Beam enhances rather than replaces sound strategic thinking?

To discuss these questions, Mosaic’s editor Jonathan Silver is joined by Yaakov Katz, former editor of the Jerusalem Post and author of the new book While Israel Slept. Together, they explore what Iron Beam means for Israel’s defense, for military cooperation between Israel and America, and the future of warfare.