The SGC
The SGC, sometimes referred to as The Azimuth Complex is located in Cheyenne Mountain as an underground command center for the operations of the Federal Fleet and Stargate operations for the Republic of MKS. It was founded in 1980 for the purpose of reverse engineering and mass production of advanced technology acquired from possible alien civilizations. In a decade the acquisition of technology and alliance from an alien race saw the fast advancement of the Federal Republic. The SGC is also tasked with overseeing of all production of the Federal Fleet ships and recently has been given the authority for all forces that deploy for expeditionary missions.
The Official Chain of Command goes from President -> Joint Chiefs -> SGC -> Federal Fleet
The SGC throughout the years has been renovated and made to withstand natural and man made disasters, it is heavily shielded against planetary bombing and serves as one of multiple facilities for the continuation of the government if the main capital should ever fall.