SDA’s Third Tranche 1 Mission  SpaceXYork Space Readies 21 Satellites for US Space Development Agency Launch  The Defense PostOn July 16, 2026, a Falcon 9 carried 21 more satellites into orbit for the Pentagon’s first operational low Earth orbit data network, pushing the constellation to half its planned size, even as the optical laser mesh that is supposed to let those satellites talk to one a  Space Daily