WASHINGTON — A report published last month by defense analyst Todd Harrison estimating the potential costs of the Golden Dome missile defense system landed like a fiscal bombshell. President Trump in May said it would cost $175 billion over three years. The Congressional Budget Office projected between $161 billion and $542 billion over two decades. Harrison’s “robust all-threat defense” scenario came in at $3.6 trillion over the same time period. 

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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...