Falcon 9 to Launch SDA Tranche 2 Tracking Layer B on 30 Sept 2026

A SpaceX Falcon 9 Block 5 rocket is scheduled to launch the SDA Tranche 2 Tracking Layer B mission from Cape Canaveral Space Force Station, Florida, on 30 September 2026 at 00:00 UTC. The mission will deliver a batch of missile-warning and missile-tracking satellites into low Earth orbit for the U.S. Space Development Agency (SDA).

What is the SDA Tranche 2 Tracking Layer?

The Tracking Layer is the missile-detection element of the SDA's Proliferated Warfighter Space Architecture, a mega-constellation of small satellites in low Earth orbit designed to detect and track hypersonic and ballistic missile threats. Each satellite carries an infrared sensor payload optimized to spot the heat signatures of maneuvering missiles against Earth's background, cueing missile-defense systems in near real time.

Tranche 2 is the third major phase of the architecture, following Tranche 0 (the demonstration layer) and Tranche 1 (the initial operational layer). The Tracking Layer satellites operate in low Earth orbit at roughly 1,000 km altitude, a regime that allows a proliferated network of dozens of spacecraft to provide global, persistent coverage that a handful of large satellites in higher orbits cannot match.

When is the launch?

The launch is targeted for 30 September 2026 at 00:00 UTC, though the status remains listed as TBD and the exact launch window and pad assignment have not yet been finalized. The mission will fly from Cape Canaveral Space Force Station in Florida. As with all SDA missions, precise timing depends on satellite readiness, range availability, and weather, so confirm the schedule close to launch day.

Which pad at Cape Canaveral?

The specific launch complex has not been confirmed. SpaceX operates Falcon 9 from Space Launch Complex 40 (SLC-40) at Cape Canaveral, and also has access to Launch Complex 39A at neighboring Kennedy Space Center. Check the Cape Canaveral launch schedule on Cosmik for the confirmed pad as the date approaches.

What is the payload?

The payload consists of SDA Tranche 2 Tracking Layer satellites built for missile warning and missile tracking. These spacecraft join the growing constellation that the Space Development Agency is deploying in successive tranches, with each launch adding several satellites to build out global coverage. The satellites are distributed across multiple orbital planes to ensure that at least one sensor is always in view of any point on Earth.

Being delivered to a circular low Earth orbit near 1,000 km, the batch adds to a constellation designed for resilience: with many small satellites rather than a few large ones, the network can absorb the loss of individual spacecraft without a critical gap in coverage.

How to watch live

SpaceX typically begins its webcast on X (formerly Twitter) and its website about 15 minutes before liftoff. Because this is a national-security mission for the Space Development Agency, live coverage may end shortly after stage separation, with limited details on the upper-stage burns and satellite deployment.

You can follow the countdown, watch the vehicle's real-time trajectory, and track the deployed satellites on Cosmik:

• See the full rocket launch schedule and set free alerts.
• Explore the mission on our live 3D satellite map.
• Follow more SpaceX launches from this operator hub.
• Read the latest launch news for updates.

Why does this mission matter?

The Falcon 9 Block 5 is the fifth and final major iteration of SpaceX's workhorse rocket, designed for rapid reuse with boosters that have flown well over a dozen times each. For the SDA, the mission continues the fastest constellation buildout in U.S. military space history, replacing decades-old missile-warning systems with a proliferated architecture in low Earth orbit.

Background details on the vehicle and operator are available via Falcon 9, SpaceX, and Cape Canaveral Space Force Station. Launch data is sourced from The Space Devs.

Follow the launch live on Cosmik

Track the countdown, watch the rocket's path in 3D, and follow the Tranche 2 satellites once they reach orbit on Cosmik. Enable free launch alerts so you never miss liftoff of the SDA Tracking Layer B mission.