Watch the US Navy shoot down a medium-range missile in its latest test after North Korea launched a missile over Japan. | Business Insider

Modern missile defense systems are designed to detect, track, and intercept incoming threats in seconds. In this video, we explain how layered air and missile defense works, the technology behind radar tracking and interceptors, and why these systems have become increasingly effective. This is a technical, non-political look at defense engineering and how nations protect their airspace. What do you think is the most important factor in missile defense? Share your thoughts below. In this video, w