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SDA Resumes Tranche 1 Transport Layer Satellite Launch

July 15, 2026

2 min read

Key Takeaways

SDA resumes Tranche 1 Transport Layer satellite launch.
21 satellites to be launched on SpaceX Falcon 9.
Total of 158 satellites planned in low Earth orbit.
Technical issues with initial satellites caused launch pause.

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Strategic Implications

The resumption of Tranche 1 Transport Layer satellite launches may indicate SDA's progress in addressing technical issues, which could strengthen the agency's position in developing a robust space-based architecture. The successful deployment of these satellites suggests a significant step towards achieving the envisioned mesh network, which could enhance the US military's capabilities in space-based communications and data transfer.

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What Happened

Space Agency Overcomes Technical Issues To Advance Constellation

The Space Development Agency (SDA) is restarting the launch of its first-generation Tranche 1 Transport Layer satellites after addressing technical problems discovered in the initial 42 birds lofted last year. The agency plans to launch 21 Tranche 1 Transport Layer birds built by York Space Systems on a SpaceX Falcon 9, with a total of 158 satellites planned in low Earth orbit. SDA director Gurpartap Sandhoo acknowledged that the agency still faces challenges, including difficulties with optical intersatellite links and obtaining Federal Aviation Administration authority to test using Link 16. The launch was first reported by Breaking Defense.

Source | Originally Published: July 16, 2026

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