A heavy mobile suit developed by Zonic as the next main mobile suit for space combat to replace MS-06. The origin of the development is the XMS-11, which was tentatively approved for the development of the new mobile suit that the Earth Federation Forces is deploying. The main purpose of the aircraft was to make it possible to carry beam weapons as the main armament, but at this point in time, a conversion design for space combat of the local warfare aircraft 09 Dom of the junior manufacturer was applied for. It was not possible to face the trial in perfect form (MS-06R-2, which was diverted and developed by the company, participated in the trial with some equipment for 11 type).
When the development of this unit was completed, the unit number was changed by the unit number integration order, and the unit was renamed MS-14. As with the previous trial, a selection competition with Zimmat's MS-15 was introduced. The MS-15, which was designed with an emphasis on fixed armaments, was rejected, and the MS-14 (formerly MS-11), which had been developed further, was given the common name GELGOOG. The main weapons were a beam rifle and a bidirectional deployable beam sword, and the portable external shield that had already been introduced in the MS-07 was adopted.
The first prototype was painted cream yellow visually and participated in various functional tests conducted at the Granada base. The feature of this machine was that the layout of the propulsion rocket engine was changed inside the waist skirt (auxiliary propulsion). The rocket was put together in a leg armor fairing) (the usefulness of the Type 09 layout was evaluated).
Given the model number YMS-14 as an additional prototype, 25 of these were delivered to the Mobile Assault Force ahead of the mass-produced MS-14A model, and the first completed unit was sent to Colonel Char Aznable at the request of Major General Kycilia Zabi. According to records from the military uncovered in a postwar investigation, the colonel was transferred to the Mobile Assault Force as commander of a special experimental unit that included the MAN-08 mobile armor, and due to his experience fighting new Earth Federation models, he showed a strong interest in the equipment of this completed unit over the MS-R09.