The Space Development Agency aims to release a formal request for proposals for its first tranche of transport communication satellites -- a capability the Pentagon expects will serve as the backbone and "main unifying thrust" of its joint all-domain command-and-control efforts, according to SDA director Derek Tournear. The agency held a virtual industry day last week, drawing more than 500 participants to hear its vision for a layered space architecture and, more specifically, its near-term plan to launch about 20...