After deploying their new Gelgoog at the Battle of A Baoa Qu, the Principality of Zeon decided to create mission specific variants of the Gelgoog, similar to that of the old MS-06 Zaku II. To that end, they created the Gelgoog Marine, or the Gelgoog F-Type specifically for Zeon's elite marine corps. To make the Gelgoog Marine maneuverable, numerous thrusters and extra propellant tanks were added to the suit. In order to cut costs, the Gelgoog's large Zulu-like shield was replaced with a "knuckle shield" taken from a modified Zaku II shoulder shield. The Gelgoog Marine could also carry a 90mm machine gun instead of a beam rifle. Many Gelgoog Marines were produced, and most ended up in the hands of Cima Garahau and her notorious Cima Fleet while others were captured by the Earth Federation and used as aggressor units for rookie pilots.