 A variant of the extended version used in desert border patrol makes use of a high @-@ <unk> canopy to allow a <unk> rear @-@ facing heavy machine @-@ gun mount , while the canopy can be extended to provide a mobile command post . An air conditioned <unk> version of the extended model is often used by officers , and a version developed for riot control has clear <unk> shielding along the rear sides and roof , as well as gunports for less @-@ lethal weapons . The shielding allows for a wide field of view while at the same time protecting against <unk> and rock @-@ throwing . 
