Space Systems Command, Space Development Agency Complete Successful Launch of First Tranche 1 Satellites
The U.S. Space Force’s Space Systems Command (SSC) Assured Access To Space (AATS) and Space Launch Delta 30 (SLD 30) teams successfully launch the Space Development Agency’s Tranche 1 Transport Layer-B (T1TL-B) mission aboard a SpaceX Falcon 9 rocket from Space Launch Complex (SLC)-4 East at 7:12 a.m. PST from Vandenberg Space Force Base, California, Sept. 10, 2025. Tranche 1 launches will continue with an approximate cadence of one launch per month for the next nine months, using National Security Space Launch (NSSL) providers, until the full space vehicle constellation is on orbit. (Credit: SpaceX)
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