STSS-ATRR

USA-205, also known as Space Tracking and Surveillance System Advanced Technology Risk Reduction (STSS-ATRR), and previously as Block 2010 Spacecraft Risk Reduction is a satellite formerly operated by the United States Missile Defense Agency. It was launched to demonstrate new technology for missile detection early warning systems. The technology demonstrated on STSS-ATRR will be used in the development of the Space Tracking and Surveillance System part of the Space-Based Infrared System.