Watch the Launch

Additional Media

SpaceX - Falcon 9 - Tranche 1 Layer B - SLC-4E - Vandenberg SFB, CA - September 10, 2025

Launch Date: September 10, 2025 Launch Time: 7:12 a.m. PDT (1412 UTC, 16:12 CEST) Launch Window: Open until 9:58 a.m. PDT Launch Site: SLC-4E - Vandenberg Space Force Base, California Targeted Orb...

Watch live: SpaceX launches SDA's first 21 Tranche 1 satellites from California on Falcon 9 rocket

Watch a live coverage as SpaceX launches a Falcon 9 rocket from California with 21 satellites for the Space Development Agency's Proliferated Warfighter Space Architecture satellite constellation. The...

Space Development Agency’s First Tranche 1 Mission

Livestream on X

SpaceX

SpaceX designs, manufactures and launches advanced rockets and spacecraft. The company was founded in 2002 to revolutionize space technology, with the ultimate goal of enabling people to live on other planets.

SDA Tranche 1 Transport Layer B

Circle Image

Overview

Destination: Polar Orbit
Mission: Government/Top Secret

Polar Orbit Space Launch Complex 4E Vandenberg SFB, CA, USA Probability: 100%
B1093 - Of Course I Still Love You

Tranche 1 Transport Layer B 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.

Telemetry

Launch trajectory and telemetry simulations provided by Flight Club - a rocket launch simulator and orbital trajectory visualiser for all things space!

Updates


Cosmic_Penguin • Sept. 10, 2025, 2:12 p.m.

Liftoff.


LL2 • Sept. 10, 2025, 1:57 p.m.

Unofficial Re-stream by SPACE AFFAIRS has started


hitura-nobad • Sept. 10, 2025, 12:35 p.m.

Now targeting Sep 10 at 14:12:11 UTC


Cosmic_Penguin • Sept. 9, 2025, 3:06 p.m.

Tweaked T-0.


Falcon 9

Family:
Configuration: Block 5

Falcon 9 is a two-stage rocket designed and manufactured by SpaceX for the reliable and safe transport of satellites and the Dragon spacecraft into orbit. The Block 5 variant is the fifth major interval aimed at improving upon the ability for rapid reusability.

See Details
Specifications
  • Minimum Stage
    1
  • Max Stage
    2
  • Length
    70.0 m
  • Diameter
    3.65 m
  • Fairing Diameter
    5.2 m
  • Launch Mass
    549.0 T
  • Thrust
    7607.0 kN
Family
  • Name
    Falcon 9
  • Family
  • Variant
    Block 5
  • Alias
  • Full Name
    Falcon 9 Block 5
Payload Capacity
  • Launch Cost
    $52000000
  • Low Earth Orbit
    22800.0 kg
  • Geostationary Transfer Orbit
    8300.0 kg
  • Direct Geostationary
  • Sun-Synchronous Capacity

Booster Info


B1093

Status: Active


Type: Core
Flight Proven: Yes
First Flight: April 7, 2025
Last Flight: September 10, 2025
Flights: 6
Landings Attempted: 6
Landings Successful: 6
Previous B1093 Flights

Landing Information

The Falcon 9 first stage B1093 has landed on ASDS OCISLY after its 6th flight.

Result: Successful Autonomous Spaceport Drone Ship landing at Of Course I Still Love You.

SpaceX

SpaceX

(SpX)

CEO: Elon Musk Founded: 2002 Successes: 554 Failures: 15 Pending: 119

Agency Type:

Space Exploration Technologies Corp., known as SpaceX, is an American aerospace manufacturer and space transport services company headquartered in Hawthorne, California. It was founded in 2002 by entrepreneur Elon Musk with the goal of reducing space transportation costs and enabling the colonization of Mars. SpaceX operates from many pads, on the East Coast of the US they operate from SLC-40 at Cape Canaveral Space Force Station and historic LC-39A at Kennedy Space Center. They also operate from SLC-4E at Vandenberg Space Force Base, California, usually for polar launches. Another launch site is being developed at Boca Chica, Texas.

INFO WIKI

Related News

Spaceflight Now

New U.S. military satellite constellation takes shape with first launch from Vandenberg SFB

The Space Development Agency’s Proliferated Warfighter Space Architecture constellation is expected to deliver global coverage beginning in 2027. Launch from Vandenberg Space Force Base occurred at 7:12 a.m. PDT (10:12 a.m. EDT / 1412 UTC).

SpaceNews

SpaceX launches 21 satellites for Space Development Agency ‘Transport Layer’ military network

The satellites, made by York Space Systems, make up the first plane of a mesh network projected to have 126 spacecraft The post SpaceX launches 21 satellites for Space Development Agency ‘Transport Layer’ military network appeared first o…

Spaceflight Now

Live coverage: Space Development Agency, SpaceX to launch next-gen national security satellites

The 21 satellites from York Space Systems are the first in the SDA’s Tranche 1 Transport Layer satellite constellation. SpaceX is targeting liftoff from pad 4 East at Vandenberg Space Force Base at 7:12 a.m. PDT (10:12 a.m. EDT / 1412 UTC).

NASASpaceflight

Launch Roundup: Cygnus XL and Progress to fly cargo missions to ISS

Two cargo resupply missions are set to launch to the International Space Station this week.… The post Launch Roundup: Cygnus XL and Progress to fly cargo missions to ISS appeared first on NASASpaceFlight.com.

SpaceNews

Space Force assigns 12 national security missions to SpaceX and ULA

The U.S. Space Force launch procurement office on June 8 announced an additional 12 missions assigned to SpaceX and United Launch Alliance under the National Security Space Launch Phase 2 contract.

Vandenberg SFB, CA, USA

Space Launch Complex 4E


Falcon 9
Success
2 days, 22 hours ago
Cygnus CRS-2 NG-23 (S.S. William “Willie” C. McCool)
Space Launch Complex 40 - Cape Canaveral SFS, FL, USA

This is the 23rd flight of the Northrop Grumman's uncrewed resupply spacecraft Cygnus and its 22nd flight to the International Space Station under th…


Falcon 9
Success
4 days, 3 hours ago
Starlink Group 17-10
Space Launch Complex 4E - Vandenberg SFB, CA, USA

A batch of 24 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.


Soyuz 2.1b/Fregat
Success
4 days, 18 hours ago
Glonass-K1 No. 18 (Kosmos 2595) & Kosmos 2596
43/3 (43L) - Plesetsk Cosmodrome, Russian Federation

Glonass-K1 are the third generation of satellite design for GLONASS satellite navigation system. GLONASS is a Russian space-based navigation system c…


Falcon 9
Success
5 days, 19 hours ago
Nusantara Lima
Space Launch Complex 40 - Cape Canaveral SFS, FL, USA

Nusantara Lima is an Indonesian geostationary communications satellite with a capacity of more than 160 Gbps.


Soyuz 2.1a
Success
6 days, 5 hours ago
Progress MS-32 (93P)
31/6 - Baikonur Cosmodrome, Republic of Kazakhstan

Progress resupply mission to the International Space Station.


Falcon 9
Success
1 week ago
SDA Tranche 1 Transport Layer B
Space Launch Complex 4E - Vandenberg SFB, CA, USA

Tranche 1 Transport Layer B is one of six missions by the United States Space Force Space Development Agency (SDA) for the Proliferated Warfighter Sp…


Long March 7A
Success
1 week, 1 day ago
Yaogan 45
201 - Wenchang Space Launch Site, People's Republic of China

A Chinese military “remote sensing” satellite of unknown purposes.


Smart Dragon 3
Success
1 week, 2 days ago
Geely Constellation Group 05
Oriental Spaceport mobile launch ship - Sea Launch

11 LEO communications satellites for Chinese car manufacturer Geely Automotive for testing autonomous driving/inter-vehicle communication services. T…


Falcon 9
Success
1 week, 4 days ago
Starlink Group 17-9
Space Launch Complex 4E - Vandenberg SFB, CA, USA

A batch of 24 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.


Long March 6A
Success
1 week, 4 days ago
Yaogan 40 Group 03
Launch Complex 9A - Taiyuan Satellite Launch Center, People's Republic of China

3 Chinese reconnaissance satellites of unknown purposes, officially reported as for "Electromagnetic environment probing".