From The Stargate Omnipedia
Alternate designation for Stargate Command in several alternate realities. Personnel from the S.G.C. have encountered a number of iterations of the S.G.A. by means of travel through the quantum mirror.
There But For the Grace of God - Jackson inadvertently returns to an Earth where the Stargate Association is operating out of Cheyenne Mountain.
Point of View - Dr. Samantha Carter and Major Charles Kawalsky arrive from an alternate reality where the Stargate is under the jurisdiction of the S.G.A.