Falcon 9 Block 5 | SDA Tranche 1 Transport Layer E

Tranche 1 Transport Layer E is one of six missions by the United States Space Force Space Development Agency (SDA) for the Proliferated Warfighter Space Architecture (PWSA) Tranche 1 Transport Layer constellation, which will provide assured, resilient, low-latency military data and connectivity worldwide to the full range of warfighter platforms from Low Earth Orbit satellites. The constellation will be interconnected with Optical Inter-Satellite Links (OISLs) which have significantly increased performance over existing radio frequency crosslinks. It is expected to operate over Ka band, have stereo coverage and be dynamically networked for simpler hand-offs, greater bandwidth and fault tolerance. This launch carries 21 satellites manufactured by York Space Systems.

This mission is flown by SpaceX. It is classified as a government/top secret mission. Liftoff is planned from Space Launch Complex 4E. Launch windows shift often; this page is rebuilt every day with the latest scheduled time.

Falcon 9 Block 5 | SDA Tranche 1 Transport Layer E is scheduled to lift off on Thursday, July 16, 2026 at 20:32 UTC. The countdown above updates live, so you always see exactly how many days, hours, and minutes are left.