Sen. Tim Sheehy (R-Mont.) speaks at the Washington Times' "Threat Status" conference. Credit: Washington Times

ARLINGTON, Va. — The U.S. Senate has formed a new “Golden Dome Caucus” focused on developing what could become one of the nation’s most expensive defense initiatives in history — a comprehensive missile shield designed to protect the American homeland from an increasingly complex array of aerial threats.

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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...