The House Growth Company is ready to launch its third batch of operational satellites designed to enhance safe communications between members of the U.S. navy and its allies throughout the globe aboard a Falcon 9 rocket from California.
The SDA’s constellation, the Proliferated Warfighter House Structure (PWSA), consists of a collection of collection of interconnected satellites with various focuses, from missile monitoring to navigation. The satellites launching on Thursday afternoon are a part of the communications layer, known as the Tranche 1 Transport Layer (T1TL).
Liftoff of SpaceX’s Falcon 9 rocket from House Launch Complicated 4 East (SLC-4E) at Vandenberg House Power Base is scheduled for 1:32 p.m. PDT (4:32 p.m. EDT / 2032 UTC).
Spaceflight Now could have stay protection starting about an hour previous to liftoff.
SpaceX will launch the T1TL-E mission utilizing the Falcon 9 first stage booster B1103, making its fourth flight after beforehand launching Starlink 17-35, Starlink 17-42, and NROL-179.
Just a little greater than 8.5 minutes after liftoff, B1103 will goal a touchdown on the SpaceX droneship, ‘Of Course I Nonetheless Love You’, positioned within the Pacific Ocean. If profitable, this would be the 211th touchdown on this vessel and the 639th booster touchdown so far for SpaceX.
Constructing out the Transport Layer
There can be 154 operational satellites unfold throughout the assorted layers of the Tranche 1 portion of SDA’s PWSA constellation. That breaks all the way down to the next, in accordance the SDA:
- 126 Transport Layer satellites
- 28 Monitoring Layer satellites
- 4 missile protection demonstration satellites
These satellites can be managed from House Operations Facilities positioned on the Grand Forks Air Power Base in North Dakota and Redstone Arsenal in Alabama.
The SDA awarded satellite tv for pc development contracts to Lockheed Martin House, Northrop Grumman Strategic House Methods and York House Methods in February 2022 to construct the satellites for the T1TL portion of the constellation.
The primary 21 T1TL satellites from York House Methods launched on the T1TL-B mission on Sept. 10, 2025. That was adopted by the T1TL-C mission a month later with satellites from Lockheed Martin.
In a September 2025 assertion to Spaceflight Now, Col. Ryan Hiserote, the U.S. House Power’s House Methods Command’s (SSC) division chief in System Delta 80 Assured Entry to House, stated that the order of the primary three missions for the SDA’s T1TL have been “interchangeable” and didn’t must fly in alphabetical order.
“York was the primary of the Tranche 1 performers to ship and launch its satellites. All spacecraft from York’s first manufacturing lot have been confirmed wholesome inside hours of launch separation, and the constellation has since handed quite a few milestones because it continues by means of early operations,” the corporate stated in a June 5 press launch.
“With this second manufacturing lot, York is once more first amongst Tranche 1 primes to finish T1 spacecraft manufacturing, persevering with to exhibit the high-rate manufacturing capabilities required to assist proliferated house architectures. Upon full supply, York’s first and second manufacturing heaps signify greater than 40 spacecraft developed in assist of the proliferated mission.”
Launch of the T1TL-E mission was awarded to SpaceX as a part of fourth order yr of missions throughout the Nationwide Safety House Launch (NSSL) Section 2 contract, which is managed by House Methods Command. Introduced in June 2023, T1TL-E was one in all six missions awarded to SpaceX.
When awarded, these missions have been scheduled to launch in fiscal yr 2025. Nevertheless, as occurs with plenty of NSSL missions, the payloads may be years not on time.
The February 2022 press launch from the SDA saying the awards for the T1TL missions acknowledged that these satellites ought to be “prepared for launch by September 2024.” Nevertheless, the primary batch didn’t fly till a yr later.
Spaceflight Now reached out to SSC to study extra about why not one of the satellites manufactured by Northrop Grumman have launched so far however we didn’t obtain a response earlier than publishing this text.
