Falcon 9 | SDA Tranche 1 Tracking Layer A — Launch 30 Sep 2026

What is launching?

SpaceX is set to launch a Falcon 9 Block 5 carrying the SDA Tranche 1 Tracking Layer A payload for the U.S. Space Development Agency. The mission lifts off from Space Launch Complex 4E (SLC-4E) at Vandenberg Space Force Base in California.

The Space Development Agency's Tracking Layer is a constellation of satellites in low Earth orbit designed to detect and track missiles, including advanced hypersonic threats, from space. Tranche 1 represents the SDA's first operational-scale batch of these tracking satellites, building on the demonstration spacecraft flown earlier under Tranche 0.

When is the launch?

The launch is currently targeted for 30 September 2026 at 00:00 UTC. The status is listed as TBD, so the date and time may shift as the mission approaches. For the latest confirmed timing, check our rocket launch schedule.

Where is it launching from?

SLC-4E at Vandenberg Space Force Base is SpaceX's primary West Coast pad, used for missions requiring polar and sun-synchronous orbits. Its high-latitude coastal location allows rockets to fly south over the Pacific Ocean, making it ideal for LEO constellations like the SDA's proliferated architecture. Browse more missions from this site on our Vandenberg launch hub.

What is the payload?

The SDA Tracking Layer is a key element of the agency's Proliferated Warfighter Space Architecture, a resilient mesh of small satellites in low Earth orbit. The Tracking Layer specializes in infrared missile detection and tracking, providing early warning and fire-control-quality data on ballistic and hypersonic missiles.

By spreading capability across many low-cost satellites rather than a few large ones, the SDA aims to make the network harder to disable and faster to update. Tranche 1 satellites operate alongside the Transport Layer, which handles data relay across the constellation.

Why does this mission matter?

Tranche 1 marks the transition from demonstration to fielded capability for the SDA. Once on orbit, these satellites feed into the U.S. military's missile-warning and missile-tracking network, expanding coverage against the growing threat of maneuvering hypersonic weapons that traditional geostationary sensors struggle to follow.

How to watch live

SpaceX typically streams Falcon 9 launches beginning a few minutes before liftoff via its official channels. National security payloads sometimes have shortened or curtailed webcasts, so coverage may end after the first-stage landing or early ascent.

• Check the confirmed launch window on our SpaceX launch schedule.
• Watch the payload and booster in context on the Cosmik live 3D solar system and satellite map.
• Track newly deployed satellites once they reach orbit using our satellite tracking guide.

What rocket is being used?

The Falcon 9 Block 5 is SpaceX's workhorse two-stage rocket, designed for rapid reuse of its first-stage booster. It is the most-flown orbital rocket in service and routinely launches both commercial constellations and U.S. government payloads. For West Coast national security missions, first-stage boosters typically return to a landing zone or drone ship in the Pacific.

Will the booster land?

SpaceX generally recovers Falcon 9 first stages either on a droneship downrange or at a landing zone near the launch site. Recovery details for this specific mission will be confirmed closer to launch. Follow our latest launch news for updates.

Data source

Launch data is aggregated from The Space Devs Launch Library. Background information references Falcon 9, SpaceX, and Vandenberg Space Force Base.

Follow the launch live on Cosmik

Don't miss liftoff. Watch the countdown on Cosmik's real-time launch tracker, follow the SDA Tranche 1 satellites in orbit after deployment, and enable free launch alerts so you're notified the moment the schedule firms up.