Based on the "X105 Strike" developed by the Atlantic Alliance, the "Striker Pack System (hereafter referred to as SPS)" installed on that unit achieved great success, and its practicality was highly praised among the military's upper echelons, leading to the development of the MS "Dagger" with a view to mass-producing SPS-compatible MS. 
Although the specifications of the "Dagger" deployed in production met the demands of the upper echelons, some technical officers were not satisfied with the unit's individual performance, and applied to the upper echelons responsible for the "Dagger" to redevelop the "X105 Strike," and after repeated requests, they were finally approved. However, this

GAT-03X2 Prototype Windam/Strike Next Generation Mass Production Test Vehicle | ユースケ's Gunpla works