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United Launch AllianceVulcanSpace Launch Complex 3E, Vandenberg SFB, CA, USA

SDA Tranche 2 Transport Layer B

Launch window

No countdown — this launch time is not yet known to the minute.

NET 2026Add to calendar

To Be Determined

Image: United Launch Alliance

Summary

SDA Tranche 2 Transport Layer B is expected to launch on an United Launch Alliance Vulcan from Space Launch Complex 3E, Vandenberg SFB, CA, USA in 2026. It is United Launch Alliance's 194th launch, 24th this year and humanity's 7,531st orbital launch attempt. It is planned as the 5th Vulcan flight. The payload is bound for Polar Orbit (PO).

Watch
No webcast announced yet.
Vehicle
Vulcan · United Launch Alliance
Booster
No booster details available.
Mission
Government/Top Secret · Polar Orbit (PO)for SDA
Milestone
Planned as the 5th Vulcan flightUnited Launch Alliance's 194th launch24th this yearhumanity's 7,531st orbital launch attempt358th orbital launch attempt this year

Flight preview

Orbit: representative

POOrbit
90.0°Inclination
180°Launch azimuth

Target site default for this orbit type. Not a catalogued object; this panel switches to the tracked orbit once the object is catalogued. Ascent drawn from padside's representative profile.

About this launch

Classified mission launched by the Space Development Agency (SDA) for Tranche 2 Transport Layer.

Pad

Map of Space Launch Complex 3E

Space Launch Complex 3E, Vandenberg SFB, CA, USA

Planned as the 55th launch from Space Launch Complex 3E, 7th this year · 950th from Vandenberg SFB, CA, USA

48 launches from this pad · 919 from Vandenberg SFB, CA, USA

about 4 years after the previous launch from this pad

All launches from Vandenberg SFB, CA, USAOpen in maps

Updates

NET September 2026.

Cosmic_Penguin · Apr 10, 2025 · source

Show 1 earlier update

  • Adding launch

    Nosu · 10/31/2023 · source

Questions

When does SDA Tranche 2 Transport Layer B launch?

SDA Tranche 2 Transport Layer B is scheduled in 2026.

Where can I watch SDA Tranche 2 Transport Layer B live?

No webcast has been announced yet.

What rocket is launching SDA Tranche 2 Transport Layer B?

Vulcan, flown by United Launch Alliance. Vulcan spec sheet

Where is SDA Tranche 2 Transport Layer B launching from?

Space Launch Complex 3E, Vandenberg SFB, CA, USA.

What orbit is SDA Tranche 2 Transport Layer B going to?

Polar Orbit (PO), a government/top secret mission.