COLORADO SPRINGS — The head of the U.S. Space Force launch enterprise said it is “unfortunate” that Blue Origin is taking far longer than expected to complete the testing and production of BE-4 rocket engines for United Launch Alliance’s Vulcan Centaur launch vehicle.

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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...