The RGM is a series of mobile suits used by the Earth Federation from U.C. 0079 till its dissolution in U.C. 0218, and typically serve as the Earth Federation Forces’ main MS. With a few exceptions, the numbers in the model number of the MS generally indicate the year of deployment. The series was initially developed by the Earth Federation itself, but Anaheim Electronics took over development in the late U.C. 0080s.