ETS 6 (Engineering Test Satellite) was developed to confirm the technology required for a geostationary three-axis satellite bus system for high performance practical satellites in the 1990's, and to test advanced satellite communications equipment.
Geostationary OrbitThe Mercury (MC) series, although known to the public as 'Advanced Vortex', are the latest generation of USAF ELINT/SIGINT satellites. They were focussed on communications intelligence (COMINT), focused at strategic level communications, but had the capability added to intercept also missile telemetry. These satellites were launched under the designation Program 7500 and were part of NRO's Program A.
Geostationary Orbit