President Donald Trump's ambitious Golden Dome missile defense project just got a reality check—and it's a big one. The Congressional Budget Office (CBO) released an estimate on Tuesday pegging the cost of developing, deploying, and operating the system over 20 years at about $1.2 trillion. That's more than six times the Pentagon's earlier projection of $185 billion.
The bulk of the expense comes from the space-based interceptor layer: a constellation of 7,800 satellites that would detect, track, and potentially shoot down incoming threats from orbit. That alone accounts for roughly 70% of the total acquisition cost, which exceeds $1 trillion. The rest goes to ground-based defenses, including interceptor missiles, sensors, and command-and-control systems.
The Golden Dome is designed to protect the entire United States, including Alaska and Hawaii, from regional threats like North Korea. But the CBO warned that the system may not be able to handle a large-scale attack from major powers such as Russia or China. So it's a shield that could stop a rogue missile but might buckle under a full salvo.
The project was launched via an executive order in January 2025, with a goal of deploying a comprehensive homeland missile defense system by 2028. Since then, it's been moving forward. In April, the U.S. Space Force selected a dozen companies to design and demonstrate space-based interceptor prototypes, with deliverables due by 2028. Among the chosen firms are Booz Allen Hamilton Holding Corp. (BAH), General Dynamics Corp. (GD) (through its Mission Systems unit), Lockheed Martin Corp. (LMT), Northrop Grumman Corp. (NOC), RTX Corp. (RTX) (parent of Raytheon), Anduril Industries, and Elon Musk's SpaceX.
Just last month, Anduril partnered with K2 Space and Voyager Technologies (VOYG) to jointly develop and test solutions for the Space Force's Space-Based Interceptor program.
The cost has been a point of contention from the start. As of March, the price tag had already surged to $185 billion—a $10 billion increase from the initial estimate. Now the CBO's $1.2 trillion figure takes the debate to a whole new level. Whether the system can deliver on its promise—and at what cost—remains an open question.
