MS-06 (A, C, F types) that proved its exceptional versatility in each tactical operation in outer space. In order to neutralize the ground forces of the Federal Army (including production bases), the Zeon General Army Command dropped them as the main force of the Earth Attack Forces on various parts of the earth's surface as mobile infantry forces for ground warfare. It is a machine that participates in the first ground descent operation, which is commonly called. Although the MS-06 fully demonstrated its mobility, it gradually became clear from local operations that it could not cope with changes in climatic conditions in various places. In order to respond to this, the tropical wetland warfare, desert warfare, and coldland warfare of the ground warfare were individually renovated by granting the necessary specialized abilities. In particular, in order to make the power and drive system of the mobile suit function efficiently under high temperature conditions, it became necessary to devise ways to improve the cooling function of each part of the aircraft. Initially, in Zeon's home country, it was assumed that the same confidentiality as in outer space would be useful for maneuvering mobile suits at high temperature and high humidity, but on the contrary, the highly confidential specifications caused many operational mechanical failures. The area around the cockpit has been significantly renovated. All front armor has been opened and closed, and the boarding method has been changed to face-to-face. Since the front armor is opened toward the upper surface, it features a hoist for raising and lowering to connect to the ground surface and a crane. Initially, the one that was refurbished from the C type to the local specifications was recognized as JC, and the later F type base refurbishment machine was also called JC for convenience.