After carrying out Operation British, in which the space colonies collided with the Earth Federation Forces' military bases (mainly Jaburo in South America) (however, the landing point was greatly misaligned, resulting in failure to destroy the intended military base), the Principality of Zeon Forces launched a new Earth Attack Force. organization. The large heat-resistant descent module HLV installed outside the ship on the cruiser Musai carried out descent operations from satellite orbit by carrying the combat vehicle Magella Attack, the local fighter Dopp, etc. in addition to the mobile suit Zaku for ground suppression. Although it is inferior to the national power, it is an extremely meticulously calculated suppression strategy. In order to build a base after the descent, the HLV was designed in advance so that it could be dismantled by Zaku and rebuilt into a simple military facility. In contrast, the Earth Federation Forces' main offensive forces consisted only of air forces and ground combat vehicle forces, and they were unable to mount a satisfactory counterattack in the face of armored mobile weapon mobile suits, which had superior mobility.
It looked like the Zeon ground forces were advancing steadily, but the Earth Federation Forces were also behind in the development of mobile suits. Operations had reached a point where they could not be ignored. War is also intelligence warfare. Information sources who had a deep network in the manufacturing industry had a general understanding of the mobile suits that the Federation Forces were developing for counteroffensive operations. When the Principality of Zeon began to struggle with the progress of ground control, the local fighter development plan following the 06-type Zaku was studied and developed based on this information. In other words, based on the Zaku, which was designed with an emphasis on versatility, it is a mobile suit that specializes in fighting against mobile suits. YMS-07 from Zeonic, which has already acquired the position of the main manufacturer, and YMS-08A, a high mobility mobile suit that emphasizes mobility, participated in the trial following the previous EMS-04 Zuda from Tsimat. The submission of the design proposal was a natural process, but without sufficient practical tests in the ground environment unfamiliar with Zeon, it was difficult to judge it as a practical model. Both sides were instructed to start prototype development immediately. In this regard, it can be said that the Zeon army had a long adaptability to the bureaucratic federal army.
The YMS-07 Prototype No. 1 has a review of armor strength and a stronger propulsion engine than the Zaku, but there was a delay in completing the planned fixed armament, and as a new model it is considered to be weak. It was completed, but when the second unit was completed, it was equipped with a 75mm 5-barrel machine gun mounted on the left arm (finger), an electromagnetic high heat conduction heat rod on the right arm, and a portable shield for defense. Adopted. In addition, the Heat Sword, which can be said to be an advanced version of the Heat Hawk, is also a weapon that indicates the operation of this aircraft. At the time of the trial, the specs were the same as those of the later production B series. In addition, the mono-eye turret is a full-circle type, which is a feature of this prototype. On the other hand, Zimat's YMS-08A, which features short-distance flight movement, was made lightweight, but the first delivery as a research mother aircraft was not possible because the output of the main engine was not satisfactory. Only 5 units were manufactured, and the position of adoption was once again handed over to Zeonic's YMS-07 (However, it is said that the main focus of the company was shifting to the epoch-making heavy mobile suit 09 type based on the following performance requirements. is called). If the propulsion engine was in place, it was planned that the 08 model would receive orders for adoption as well as the 07 model.
Zeon's first mobile suit for land-based local warfare was officially adopted as the MS-07 Gouf, and was immediately put on the production line at the requisitioned base in California, the development base. The production lines for the MS-06J type for land warfare and the MS-06D type for tropical warfare have been converted to the 07 type.
Although the 07 model had a significantly different structural design from the Zaku, the initial production model 07A was delayed in the production of its dedicated fixed armament, and was deployed to the front line as one equipped with a normal manipulator. On the orders of Lieutenant General Dozle Zabi of the Space Attack Force, Lieutenant Ramba Ral, who was assigned to the pursuit mission, received a YMS-07B model (No. rice field. Although this machine was an increased prototype, it was also a special machine that had been fine-tuned down to the smallest detail.