WASHINGTON — Gen. Michael Guetlein on May 14 forcefully rejected a new Congressional Budget Office estimate that President Donald Trump’s proposed Golden Dome missile defense initiative could cost $1.2 trillion over 20 years, arguing the analysis relies on outdated assumptions and does not reflect the architecture the Pentagon is actually pursuing.

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Sandra Erwin writes about military space programs, policy, technology and the industry that supports this sector. She has covered the military, the Pentagon, Congress and the defense industry for nearly two decades as editor of NDIA’s National Defense...