SpaceX is preparing to launch 21 communications satellites for the Space Development Agency aboard a Falcon 9 rocket from California on Thursday, continuing the buildup of the agency's military constellation in low Earth orbit.
What Happened
A batch of 21 satellites manufactured by York Space Systems are encapsulated in a Falcon 9 payload fairing at Vandenberg Space Force Base ahead of the Tranche 1 Transport Layer E (T1TL-E) mission. Liftoff is scheduled for 1:32 p.m. PDT from Space Launch Complex 4 East. The first stage booster, B1103, will attempt landing on the droneship "Of Course I Still Love You" in the Pacific Ocean roughly 8.5 minutes after liftoff, marking its fourth flight. This would be the 211th landing on that vessel and the 639th booster landing overall for SpaceX.
Why It Matters
The satellites are part of the SDA's Proliferated Warfighter Space Architecture (PWSA), a constellation designed to provide secure communications between U.S. military branches and allied forces globally. The Tranche 1 portion will eventually comprise 154 operational satellites across transport, tracking, and missile defense demonstration layers. York noted that its first and second production lots represent more than 40 spacecraft developed in support of the proliferated mission. The launch would bring total T1TL spacecraft launched to at least 42, following previous batches from York (September 2025) and Lockheed Martin (October 2025).
The Bottom Line
The T1TL-E mission marks SDA's third batch of operational communications satellites and SpaceX's third T1TL launch under the NSSL Phase 2 contract. Schedules have slipped from an original September 2024 target to fiscal year 2025 and now into 2026.