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Falcon 9 Block 5 | USSF-366
Falcon 9 is set to launch Falcon 9 Block 5 | USSF-366 on Sat, Aug 15, 2026, 09:52 PM UTC from Vandenberg SFB, CA, USA.
Go for LaunchSpaceX
Liftoff in
04days
22hrs
00min
NET Sat, Aug 15, 2026, 09:52 PM UTC
Live coverage
Watch the webcast
Mission profile
The flight at a glance
Falcon 9Vehicle
SpaceXProvider
Space Launch Complex 4EPad
Vandenberg SFB, CA, USALocation
Government/Top SecretMission type
Low Earth OrbitOrbit
Flight sequence
Mission timeline
Key events from liftoff — ignition, staging, separation and deployment — with their times relative to T0.
- GO for Prop LoadT- 00:38:00
- Prop LoadT- 00:35:00
- Stage 1 LOX LoadT- 00:35:00
- Stage 2 LOX LoadT- 00:16:00
- Engine ChillT- 00:07:00
- StartupT- 00:01:00
- Tank PressT- 00:01:00
- GO for LaunchT- 00:00:45
- IgnitionT- 00:00:03
- LiftoffT+ 00:00:00
- Max-QT+ 00:01:07
- MECOT+ 00:02:25
- Stage 2 SeparationT+ 00:02:29
- SES-1T+ 00:02:36
- Fairing SeparationT+ 00:02:58
- Entry Burn StartupT+ 00:06:01
- Entry Burn ShutdownT+ 00:06:25
- Stage 1 Landing BurnT+ 00:07:58
- Stage 1 LandingT+ 00:08:20
Flight simulation
Ascent to orbit
A representative gravity-turn climb for Falcon 9 to Low Earth Orbit. Illustrative model — not this mission’s live telemetry.
Mission timeT+0:00
Altitude0.0 km
Velocity0.00 km/s
PhaseLiftoff
T+0:00 / 8:00
SimulatedRepresentative Falcon 9 ascent profile — illustrative model, not this mission’s live telemetry.
The mission
USSF-366
USSF-366 is a classified mission for the United States Space Force. It is possibly a batch of classified LEO satellites for a US government entity based on SpaceX’s Starshield satellite bus, based on locations of rocket stage drop zones being exact fits with previous Starlink Group 15 launches.
Around this launch
Related news
No news linked to this launch yet
As coverage publishes, deduplicated articles about this mission will appear here.
Good to know
Frequently asked
What time does Falcon 9 Block 5 | USSF-366 launch?
Falcon 9 Block 5 | USSF-366 is scheduled to lift off Sat, Aug 15, 2026, 09:52 PM UTC — this page shows a live countdown.
Where can I watch Falcon 9 Block 5 | USSF-366?
A live webcast will appear on this page as soon as the provider publishes a stream link.
Who is launching Falcon 9 Block 5 | USSF-366?
Falcon 9 Block 5 | USSF-366 is a SpaceX mission flying on a Falcon 9.
Where does Falcon 9 Block 5 | USSF-366 launch from?
It lifts off from Space Launch Complex 4E, Vandenberg SFB, CA, USA.