WASHINGTON — As it prepares to launch the first satellites for its Lightspeed low Earth orbit constellation, Telesat is sharpening its pitch to U.S. defense customers with a planned laser communications demonstration and changes to its system design aimed at military compatibility.

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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...