Grethe Wenzel is a secondary supporting character in the 86 -Eighty Six- series introduced in Run Through the Battlefront. Grethe is the developer of the XM2 Reginleif and the heir to WHM, a family owned military-industrial complex. She was previously the commander of the 1028th Trial Unit, created in order to test her newly developed Feldreß. (Source: 86 -Eighty Six- Wiki)