Schwinn Coleman's GM

After getting his Gouf Custom damaged in combat, a Medea is shot down containing a prototype GM, far superior to the standard models (basically imagine a GM II being produced almost ten years early, it's that far advanced) and Schwinn chooses to claim it as his own personal MS, believing that if the Zeon homeland could get it, they can change the course of the war, thus launching the team's desperate mission to make it back into space.