NATIONAL HARBOR, Md. — A growing crop of startups in the space industry are developing propulsion systems for small satellites. The demand is driven by commercial constellations but propulsion suppliers also see opportunities in the military market as the Pentagon shifts focus to small satellites.

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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...