By Allen Cone SpaceX launched 21 satellites on Wednesday for the Space Development Agency's Tranche 1 Transport Layer from California. Screenshot from SpaceX/X Oct. 15 (UPI) -- SpaceX's Falcon 9 rocket launches 90th Starlink mission of 2025 The network will use high-speed optical and radio frequency links on board the Transport SVs "to achieve high data rates at extremely low latencies." "The Transport Layer will be a proliferated constellation of hundreds of space vehicles (SVs), in low-Earth orbit (LEO)," the agency said. "Additional Transport Layer SVs are deployed to add resilience and targeted technological enhancements." The Trench 2 is scheduled to begin launches in fiscal year 2027 to "both replenish and enhance the capability provided by Tranche 1 by increasing the overall number of SVs and by introducing new capabilities," including new tactical data links and new waveforms, it said. The next launch from Vandenberg is scheduled for Friday night of 28 Starlink satellites. SpaceX also plans to launch 28 Starlink satellites at 5:27 a.m. EDT Thursday from Cape Canaveral Space Force Station's Pad 40 in Florida. The private company's last launch from Florida was Monday night of 24 Project Kuiper satellites for Amazon's broadcast Internet. The Falcon 9 lifted off at 11:27 p.m. from Cape Canaveral Space Force Station. Topics