"The mobile armor was transformed from the model of WF-04a industrial use armor. It is the first militarization of mobile armors. The breakthrough was a result of an invasion of the Zamaii's border by the militant organizations. Zamaii, the town of a small agricultural state making little progresses in armaments, loaded the mobile armor with four 90mm machine guns and four cannon urgently after the invasion. Well, this does not look promising at all. Believe it or not, with the main body of this prototype was a well developed model of WF industrial series, the weaponry has become the main defending force of the homeland. The four cannons provide reliable defense in the middle distance, we soldiers gave the four cannons a nickname of “Quad Eyes” meaning double protection for them. After that invasion, the Zamaii's military officially incorporated the “Quad Eyes” into the team, named ST-1 STRONGHOLD, kick started the age of mobile armor development for military use."
Handwriting from Bob's diary