DoD uses this band as the only communications link for initial contact with newly launched satellites, for early orbit checkout of those satellites and for emergency access to spinning/tumbling satellites. It is also vital for command and control, mission data retrieval, and on-orbit maneuvering of its many satellites in all orbits from low earth to geostationary. SGLS, the primary component of this network, provides continuous, worldwide, command and control of satellites used for missile warning, navigation, military communications, weather tracking and reporting, and intelligence, surveillance and reconnaissance (ISR). The information provided by these satellites to our National Command Authority, Combatant Commanders, Military Services, and national level decision-makers is crucial to successful execution of our national strategies. Additionally, other federal government agencies, such as the Federal Aviation Administration (FAA), the National Aeronautics and Space Administration (NASA), the Federal Emergency Management Agency, state and local governments and the commercial sector benefit from the capabilities of the satellites controlled by this network.