Space Network (SN) is a NASA program that combines space and ground elements to support spacecraft communications in Earth vicinity. The SN Project Office at Goddard Space Flight Center (GSFC) manages the SN, which consists of: * The geosynchronous Tracking and Data Relay Satellites (TDRS), * Supporting ground terminal systems, * The Bilateration Ranging and Transponder System (BRTS), * Merritt Island Launch Annex (MILA) relay, * Network Control Center Data System (NCCDS).