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SpaceX

USSF-366

Falcon 9 Block 5

T-minus to liftoff

HOURS

MINUTES

SECONDS

Saturday August 15 2026, 21:52:00 UTC

StatusGo

Scrub riskLOW

Go93%

VehicleFalcon 9 Block 5

OrbitLow Earth Orbit

PadSpace Launch Complex 4E

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Acquiring satellite view…

Trajectory unknown

3 hazard areas

Space Launch Complex 4E

Vandenberg SFB, CA, USA

34.632, -120.611

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Mission

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.

Reusable Hardware

All boosters →

First Stage · Flight-provenB1088

active18th flight

Flights17

Landings17/17100%

Fastest turn9d 3h

Targeting ASDS · OCISLY· 574 km downrange

48d 5h since last flight

Falcon 9 booster.

Previous flights · 17

Q's read

Weather & scrubLOW risk

Weather Go93%Wind3 m/sGusts4 m/sCloud90%Temp18°C

Hazards (1)

NAVAREA XII 539/26. NORTH PACIFIC. CALIFORNIA. 1. HAZARDOUS OPERATIONS, ROCKET LAUNCHING: A. 152152Z TO 160215Z AUG, ALTERNATE 162138Z TO 170201Z, 172124Z TO 180147Z, 182110Z TO 190133Z, 192056Z TO 200119Z, 202042Z TO 210105Z AND 212029Z TO 220052Z AUG IN AREA BOUND BY 34-28.00N 120-21.00W, 34-40.00N 120-37.00W, 34-39.00N 120-39.00W, 34-34.00N 120-39.00W, 34-19.00N 120-34.00W, 33-04.00N 119-51.00W, 32-20.00N 119-20.00W, 32-21.00N 119-18.00W 33-03.00N 119-37.00W. B. 152152Z TO 160217Z AUG, ALTERNATE 162138Z TO 170203Z, 172124Z TO 180149Z, 182110Z TO 190135Z, 192056Z TO 200121Z, 202042Z TO 210107Z AND 212029Z TO 220054Z AUG IN AREA BOUND BY 29-48.00N 117-39.00W, 31-20.00N 118-49.00W, 31-19.00N 118-50.00W, 30-36.00N 118-39.00W, 29-54.00N 118-22.00W, 29-24.00N 118-08.00W. C. 152152Z TO 160235Z AUG, ALTERNATE 162138Z TO 170221Z, 172124Z TO 180207Z, 182110Z TO 190153Z, 192056Z TO 200139Z, 202042Z TO 210125Z AND 212029Z TO 220112Z AUG IN AREA BOUND BY 29-48.00N 117-39.00W, 29-24.00N 118-08.00W, 29-15.00N 118-02.00W, 29-02.00N 117-59.00W, 28-13.00N 117-21.00W, 29-36.00N 117-16.00W. 2. CANCEL THIS MSG 220212Z AUG 26.

Launch Timeline

Countdown

T-00:38:00

GO for Prop Load

T-00:35:00

Stage 1 LOX Load

T-00:35:00

Prop Load

T-00:16:00

Stage 2 LOX Load

T-00:07:00

Engine Chill

T-00:01:00

Tank Press

T-00:01:00

Startup

T-00:00:45

GO for Launch

T-00:00:03

Ignition

In-flight

T+00:00:00

Liftoff

T+00:01:07

Max-Q

T+00:02:25

MECO

T+00:02:29

Stage 2 Separation

T+00:02:36

SES-1

T+00:02:58

Fairing Separation

T+00:06:01

Entry Burn Startup

T+00:06:25

Entry Burn Shutdown

T+00:07:58

Stage 1 Landing Burn

T+00:08:20

Stage 1 Landing

Quick facts

VehicleFalcon 9 Block 5

OrbitLow Earth Orbit

PadSpace Launch Complex 4E

SiteVandenberg SFB, CA, USA

WindowSaturday August 15 2026, 21:52:00 UTC→Sunday August 16 2026, 01:52:00 UTC

Vehicle

FamilyFalcon

Height70 m

Diameter3.7 m

Stages2

ReusableYes

LEO capacity22,800 kg

Track record619/620 successful

Landings605/610