It was barely a month ago that Iran attacked Israel with 170 drones, 110 ballistic missiles and 30 cruise missiles. This nighttime barrage was remarkable not only for its scope but also for the fact that it represented the first direct Iranian attack on Israel from the Islamic republic’s own territory. Even more impressive, though, was the allied response: No Iranian weapons hit their targets in Israel, many having been shot down before even reaching Israeli airspace. This saved lives, set the stage for de-escalation between Israel and Iran — and illuminated new realities about 21st-century air defense. The United States would be wise to incorporate the lessons into its own military planning.