U.S. President Donald Trump has picked a design for his Golden Dome missile defense system and named a leader of the ambitious $175 billion defense program. Here are some key details about the project: HOW WILL IT WORK?

President Trump has proposed building an antimissile “golden dome” around the United States. But do cinematic spectacles actually enhance national security?

The administration’s hallmark defense project will be comprised of four layers — one space-based and responsible for sensing and tracking missile attacks, and three land-based, equipped with interceptors, radars and potentially lasers. The plans also include 11 short-range missile batteries across the continental United States, Hawaii and Alaska.