Join our newsletter to get the latest military space news every Tuesday by veteran defense journalist Sandra Erwin. WASHINGTON — U.S. military satellites manufactured by York Space Systems and SpaceX successfully demonstrated cross-vendor laser communications link in low Earth orbit, marking a milestone for the Pentagon’s next-generation satellite network. The satellites are part of the U.S. Space Force’s Proliferated Warfighter Space Architecture (PWSA), a network designed to enhance military communications and missile tracking capabilities. The demonstration involved satellites from PWSA’s Tranche 0, an initial phase comprising 27 satellites operating at…