The RGM-79 GM, supposedly an acronym of Gundam Mass-production type, is the mass-produced version of the RX-78 Gundam. Though many variants were produced over the years, the RGM-79 GM was the Federation's first true mass-produced mobile suit. After the conclusion of the One Year War, the GM and its variants became the staple of the Earth Federation military, and is the most time-withstanding family of mobile suits in U.C. history.