WASHINGTON — Congressional budget analysts have finally been briefed on the Pentagon’s classified Golden Dome architecture, six months after producing a $1.2 trillion estimate that has become a flashpoint in the debate over the missile-defense program.

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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...