In flight Falcon 9 Block 5 | USSF-481 Watch
Photo: Bill Ingalls · Public domain (US government)

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SDA Tranche 1 Transport Layer A

Success Launch Successful SpaceX, Falcon 9 Block 5

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Mission: SDA Tranche 1 Transport Layer A

Government/Top Secret · Polar Orbit

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.

Customers: Space Development Agency

Where to watch

Official Webcast SDA's Fourth Tranche 1 Mission SpaceX · English Unofficial Re-stream SpaceX SDA Tranche 1 Transport Layer A The Space Devs · English Unofficial Webcast Live: SpaceX Falcon 9 rocket launches from California for U.S. Military's Space Development Agency Spaceflight Now · English

Timeline

  1. T−00:38:00 GO for Prop Load
  2. T−00:35:00 Prop Load
  3. T−00:35:00 Stage 1 LOX Load
  4. T−00:16:00 Stage 2 LOX Load
  5. T−00:07:00 Engine Chill
  6. T−00:01:00 Startup
  7. T−00:01:00 Tank Press
  8. T−00:00:45 GO for Launch
  9. T−00:00:03 Ignition
  10. T+00:00:00 Liftoff
  11. T+00:01:04 Max-Q
  12. T+00:02:14 MECO
  13. T+00:02:18 Stage 2 Separation
  14. T+00:02:25 SES-1
  15. T+00:02:31 Booster Boostback Burn Startup
  16. T+00:03:04 Fairing Separation
  17. T+00:03:24 Booster Boostback Burn Shutdown
  18. T+00:06:09 Entry Burn Startup
  19. T+00:06:21 Entry Burn Shutdown
  20. T+00:07:15 Stage 1 Landing Burn
  21. T+00:07:19 Stage 1 Landing

Updates

  • Launch success. source
  • Liftoff! source
  • Unofficial Re-stream by SPACE AFFAIRS has started source
  • Tweaked T-0. source
  • Tweaked T-0. source
  • Delayed to NET October 10. source
  • Delayed to NET October 9. source
  • Delayed to NET October 8. source
  • Tweaked T-0. source
  • Unofficial Re-stream by SPACE AFFAIRS has started source
  • Unofficial Re-stream by SPACE AFFAIRS has started source
  • Unofficial Re-stream by SPACE AFFAIRS has started source
  • Confirmed rescheduled for October 6. source
  • Scrubbed for the day. source
  • Hold at T-00:58. source
  • Unofficial Re-stream by SPACE AFFAIRS has started source
  • Now targeting Oct 05 at 08:18 UTC source
  • Tweaked T-0. source
  • Now targeting Oct 05 at 08:17 UTC source
  • GO for launch. source
  • NET October 5 per marine navigation warnings, TBC. source
  • NET October. source
  • NET September. source
  • NET mid-February. source
  • Delayed to NET early 2026. source
  • NET March 2025. source
  • NET late 2024. source
  • Adding launch source