DSCS IIIB-13 & Falcon Gold

DSCS-3 (Defense Satellite Communications System 3) are geostationary communications satellites, which provide a robust anti-jam, nuclear hardened capability that supports Department of Defense (DoD) worldwide requirements, White House and Diplomatic communications. They are the follow-on generation of the DSCS-2 satellites.

Falcon Gold was an US Air Force Academy experiment to demonstrate use of GPS navigation in orbits above the GPS constellation.