Aside from the CSA, the m'Yalfor'ac Order also possessed Espo Walker 91s. It was believed that the order obtained them by hijacking a Corporate Sector Authority freighter traveling through the Kadok Regions. The m'Yalfor'ac Order employed this walker on the l'Quart'a continent on the Bitthævrian homeworld Guiteica.
The Order found that the Espo Walker 91 performed excellently as both a patrol and defensive vehicle, operating in the steep ranges in the northern areas of l'Quart'a.
Since being replaced by the Espo Walker 101, any potential buyer could only find used walkers of this kind.