NRO Proliferated Architecture Mission

The National Reconnaissance Office (NRO) Proliferated Architecture Mission represents a transformation approach to satellite-based intelligence, surveillance, and reconnaissance (ISR) capabilities for the United States. Unlike traditional NRO programs that relies on number of large and complex satellites, the Proliferated Architecture employs a constellation of numerous smaller, cost-effective, satellites deployed across multiple orbital planes.

Source: Wikipedia — NRO Proliferated Architecture Mission (CC BY-SA 4.0)