Theoretical

 In the Stargate universe, the SGC stands for Stargate Command, a top-secret, 

-run organization housed deep within the Cheyenne Mountain Complex in Colorado, responsible for operating the Stargate device for off-world exploration, defense, and diplomacy. It's the central hub for Earth's interstellar operations, managing teams (like SG-1) that travel through the alien portal to new worlds to find technology and allies against threats. 

Key Functions of the SGC:

Operates the Stargate: Manages the alien device that allows instantaneous travel across vast distances.

Manages SG Teams: Organizes and directs military/scientific teams (SG-1, SG-2, etc.) for missions.

Defense: Protects Earth from extraterrestrial threats like the Goa'uld.

Exploration & Diplomacy: Facilitates contact with alien civilizations to gather technology and build alliances.

Research: Conducts research on alien artifacts and technology, often at off-site locations like Area 51. 

Location:

Underground in the Cheyenne Mountain Complex, near Colorado Springs, Colorado, beneath the NORAD facility. 

In essence, the SGC is Earth's primary gateway and command center for the entire Stargate Program, managing humanity's first steps into the galaxy.