The Pentagon admits it exists. The Missile Defense Agency has funded it with hundreds of millions of dollars. A major U.S. defense contractor is building it right now. And yet, almost nothing about how it works has ever been released to the public.This video breaks down everything we do know about the Glide Phase Interceptor (GPI) — the next-generation U.S. missile defense system designed to intercept hypersonic glide vehicles during the most dangerous and elusive phase of flight. Unlike traditional missile defenses that focus on boost or terminal phases, GPI is intended to engage hypersonic weapons while they are maneuvering at extreme speeds along the edge of Earth’s atmosphere, a region where current interceptors struggle or fail entirely.We explore the origins of the Glide Phase Interceptor program, beginning with the Missile Defense Agency’s Regional Glide Phase Weapon System concept, and trace its rapid evolution into one of the most classified and urgent defense initiatives in the United States arsenal. The video explains why Raytheon, Northrop Grumman, and Lockheed Martin were originally selected, why Northrop ultimately emerged as the prime contractor, and what the funding timeline reveals about the seriousness of the threat.You’ll learn how GPI fits into the broader U.S. missile defense architecture, including its integration with Aegis Ballistic Missile Defense destroyers, the Mk 41 Vertical Launch System, AN/SPY-1 and SPY-6 radars, and space-based sensors like SBIRS, OPIR, and the upcoming Hypersonic and Ballistic Tracking Space Sensor constellation. We also explain why the Pentagon has deliberately avoided releasing specifications such as speed, range, seeker type, maneuver limits, or engagement envelope — and why that silence is itself a strategic signal.The video also examines the hypersonic threat landscape, including China’s DF-21D and DF-26 anti-ship ballistic missiles, often referred to as “carrier killers,” and why intercepting these weapons during the glide phase could fundamentally alter the balance of naval power in the Indo-Pacific. Rather than speculation, this analysis focuses strictly on publicly acknowledged programs, official budget documents, and statements from the Missile Defense Agency and defense contractors.This is not hype. It’s not science fiction. It’s a real weapon program that exists largely in the shadows — and one that could determine whether hypersonic weapons remain a decisive advantage or become just another problem missile designers can no longer rely on.If you’re interested in U.S. missile defense, hypersonic warfare, naval power, classified defense programs, or how modern wars are decided before they begin, this video lays out the facts — and explains why what the Pentagon doesn’t say may matter more than what it does.