SDA Tranche 1 Transport Layer A

Falcon 9 Block 5 · SpaceX

NET September 2026

Tranche 1 Transport Layer A 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 Northrop Grumman.

Launch site
Space Launch Complex 4E, Vandenberg SFB, CA, USA
Vehicle
Falcon 9 Block 5
Provider
SpaceX
Orbit
PO
Payload
SDA Tranche 1 Transport Layer A
Status
TBD
Booster
Unknown F9
Vehicle height
70 m
Liftoff thrust
7,607 kN
Vehicle type flights
630
Vehicle type success rate
99.8%

What changed

  1. AUG 27 · 4:00 PM UTC
    NET September.
    Launch Library note·Source
  2. DEC 23, 2025 · 7:50 PM UTC
    NET mid-February.
    Launch Library note·Source
  3. DEC 6, 2025 · 7:21 AM UTC
    Delayed to NET early 2026.
    Launch Library note·Source

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