Technology & Combat Characteristics
A mass production mobile suit used by the Human Reform League (HRL), by A.D. 2307, the MSJ-06II-A Tieren Ground Type has been in service for more than a decade. It underwent several revisions through the years, but its basic structure remains unchanged. The Tieren Ground Type is considered the standard model of the Tieren series and with its excellent performance, characteristics and high versatility, it is used as the basis for developing other variants, including a space type. Other weapons of the machine are a small caliber machine gun in its left chest, three shields, and an optional bazooka. The cockpit of the Tieren Ground Type and its variants is relatively cramped with the pilot controlling the machine in a standing position. Since operations typically do not last more than an hour, the cockpit's livability is not deem to be so essential. The cockpit of the Tieren series usually have no monitors, external images and data are transmitted to the pilot's helmet goggle and projected directly onto the pilot's retina. However, this is not a result of inferior development capabilities.
The alphabet at the end of the Tieren series' model number is an indicator of the mobile suit's type. While many armed forces use abbreviations of the mobile suit type, the HRL labels their mobile suits sequentially from the letter 'A' without regards to their actual typing. The known designations are: A -> ground type, B -> two seater ground type, C -> high mobility type, D -> two seater high mobility type, E -> space type, F -> two seater space type. Additionally, alphabets corresponding to the mobile suit's type are used for special variants. For example: LC -> long-range shooting type (Long-range Cannon Type), SP -> super soldier type (Super-pilot Type). The alphabetical labeling seems to be reset for the new "06III" generation, as the MSJ-06III-A Tieren All Region Type uses the letter 'A' despite not being a ground mobile suit.
With the appearance of Celestial Being's highly powerful and mobile Gundams, and the United Nation Forces' deployment of the GNX-603T GN-X as a counter, the time has come for the Tieren Ground Type to step down as the HRL's mainstay mobile suit. Similarly, the project to develop Tieren series' successor machine is terminated while in the prototype phase. In the aftermath of Celestial Being's collapse and with the world unifying as one, the Tieren Ground Type, which has retired from the frontline, is still deployed in certain locations in roles such as guard units due to the limited numbers of GN Drive Tau-type mobile suits. Moreover, the mobile suit tactics that have matured alongside the usage of the Tieren Ground Type is highly regarded within the UN Forces, and continued to be practiced as part of the forces' doctrine.
History
The MSJ-06II-A Tieren Ground Type served as the HRL's primary mass production mobile suit in A.D. 2307. In operation for more than ten years, it was also provided to the bloc's allies such as the Tamil Tigers. Despite their excellent qualities, the Tieren Ground Type and its variants were no match for the power of the Gundams used by Celestial Being. Ultimately, the Tieren series was retired from the frontlines and replaced by the more advanced GN-X series starting in A.D. 2308. However, they were still deployed in certain limited roles, such as guarding of bases and facilities. The GNX-704T Ahead that debuted in A.D. 2312 was considered to be the successor of the Tieren series and was developed by a team from the HRL that also developed the MSJ-06III-A Tieren All Region Type. By A.D. 2312, some Tieren Ground Types were acquired and deployed by the anti-Federation organization Katharon.