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CLASSIFIED

PRAETORIAN SDA_616

US Military Mesh Communications (PWSA Transport Layer) · York Space Systems / US Space Development Agency

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PRAETORIAN SDA-615, one of York Space Systems' Tranche 1 Transport Layer satellites for the US Space Development Agency's Proliferated Warfighter Space Architecture — the Pentagon's answer to a fundamental problem: how do you build military space infrastructure that isn't an easy, high-value target? Rather than a handful of expensive satellites, the SDA is deploying over 150 nearly identical, mass-produced Transport Layer spacecraft in low Earth orbit, connected via optical laser inter-satellite links into a resilient global mesh network. This satellite contributes part of the broader Proliferated Warfighter Space Architecture the White House has cited as foundational to the future Golden Dome missile defense system.

Its orbit

Orbit
Low Earth Orbitcan appear as a fast-moving star at dawn or dusk
Altitude
592–597 mi (953–960 km)
Inclination
81.3°
One orbit
104.0 minutes13.8 orbits a day
NORAD ID
65579
Int’l designator
2025-203Q
Launched
2025

Orbital elements from CelesTrak, as of 22 Sep 2026.

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