Sierra Space has completed the Critical Design Review (CDR) for the Space Development Agency's (SDA) Tranche 2 Tracking Layer, confirming readiness to begin production of missile tracking satellites for the Proliferated Warfighter Space Architecture (PWSA). The program will see Sierra Space deliver two orbital planes, totaling 18 satellites, each carrying advanced infrared sensors designed to detect and track ballistic, hypersonic, and emerging threats.

Each constellation plane will host multiple missile warning and tracking sensors, including a missile defense sensor, forming part of the resilient early detection capability that underpins U.S. and allied missile defense. The CDR approval allows Sierra Space to move into assembly, integration, and testing, with hardware already arriving a

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