SDA Tranche 1 Transport Layer E

SDA Tranche 1 Transport Layer E launched on a SpaceX Falcon 9 Block 5 from Space Launch Complex 4E, Vandenberg SFB, CA, USA on July 16, 2026 at 20:32 UTC. The launch window ran from 20:22 to 21:09 UTC. It was SpaceX's 705th launch, 86th this year and humanity's 7,342nd orbital launch attempt. It was the 610th Falcon 9 Block 5 flight and the 84th this year. Booster B1103 flew for the 4th time and landed at Of Course I Still Love You. The payload was bound for Polar Orbit (PO). The earliest tracked orbit of PRAETORIAN SDA_501, one of 21 catalogued objects, from July 23, 2026, was 942 × 961 km inclined 81.5°.

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.