SDA Tranche 1 Tracking Layer E
Vulcan, United Launch Alliance
Space Launch Complex 3E, Vandenberg SFB, CA, USA
Launch time
No earlier than
NET 2026
Current date is a placeholder or rough estimation based on unreliable or interpreted sources.
How sure is this date?
The source gives year precision. Launch plans can change.
Launch record updated by LL2
Feed checkedMission
SDA Tranche 1 Tracking Layer E on Vulcan. NET 2026. Status: TBD. Launch site: Space Launch Complex 3E. Source: Launch Library 2.
Tranche 1 Tracking Layer E is one of five missions by the United States Space Force Space Development Agency (SDA) for the Proliferated Warfighter Space Architecture (PWSA) Tranche 1 Tracking Layer constellation, which will provide global indications, warning, tracking, and targeting of advanced missile threats, including hypersonic missile systems.
- Mission type
- Government/Top Secret
- Orbit
- Polar Orbit
Launch context
Generated from source records
SDA Tranche 1 Tracking Layer E: Vulcan, operated by United Launch Alliance. Pad: Space Launch Complex 3E, Vandenberg SFB, CA, USA. Mission type: Government/Top Secret; target orbit: Polar Orbit. Listed timing: NET 2026. TBD means this is a provisional date. Provider: 11 orbital attempts in our records since 28 Apr 2025, including 5 in 2026 (UTC).
Partial historical coverage. Records snapshot: .
What these records cover
Partial coverage of stored records, not lifetime or worldwide totals. Counts use known orbital attempts with a source date at or before this snapshot and a status confirming liftoff or an outcome. Scheduled, upstream-missing, suborbital and unknown-orbit records are excluded. Source dates are NET estimates, not verified actual liftoff times.
The vehicle percentage is Success / (Success + Failure + Partial Failure). In Flight and Payload Deployed count as attempts but are excluded from that denominator. Figures describe the stored record at this snapshot, not the vehicle's flight number or a prediction of this launch's outcome.
Launch Library 2 record checked . Recorded timing does not establish actual liftoff; plans can change.
Launch data: The Space Devs (Launch Library 2)Launch timeline
No timeline has been provided by the source.
Slip history
Changes recorded by Space Right Now
Tracking since . 1 recorded change.
Date moved later or became less certain 1 time.
- Recorded change
Date became less certain: from Quarter 4 to Year
Source updates from Launch Library 2 (2)
Announcements supplied by LL2 may predate our tracking. They are separate from changes observed by Space Right Now.
- LL2 update
Launch vehicle swap with SDA Tranche 1 Tracking Layer D.
Read the source update - LL2 update
Adding launch
Read the source update
Launch pad
Space Launch Complex 3E
Vandenberg SFB, CA, USA (US)
Coordinates: 34.64, -120.5895
View launch pad on a map