CBO analysis: Golden Dome could cost $1.2 trillion over 20 years

A new CBO analysis estimates the Golden Dome missile-defense architecture could cost about $1.2 trillion over 20 years—far above the White House's $175 billion target—largely due to a space-based interceptor layer; the system would cover the U.S. but would not be an impenetrable shield against a major peer attack, and long-term costs depend on architecture details the DoD has not publicly disclosed, with some items potentially funded from other accounts and space-based interceptors possibly omitted for cost reasons.