PREVIOUS WORK HAS FOCUSED ON DEVELOPING DISCRETE ELEMENT METHOD (DEM) MODELS USING THE COUPI DEM TO DESCRIBE THE MECHANICAL BEHAVIOR OF MARS SOIL AND TO EXAMINE ITS INFLUENCE ON THE MOBILITY OF MARS EXPLORATION ROVER (MER) WHEELS. RESULTS FROM THIS WORK HAVE SUCCESSFULLY REPLICATED LABORATORY TESTS OF MER WHEEL MOBILITY AT LOW TO MODERATE WHEEL SLIP AND HAVE ACCURATELY PREDICTED MER WHEEL MOBILITY BEHAVIOR AT HIGH WHEEL SLIP (HIGH SLIP EXPERIMENTAL DATA ONLY BECAME AVAILABLE AFTER MODEL PREDICTIONS WERE MADE). SINCE MERS HAVE EXPERIENCE HIGH SLIP CONDITIONS THAT HAVE THE POTENTIAL TO END MISSION OPERATIONS IT IS IMPORTANT TO BE ABLE TO SIMULATE ROVER MOBILITY AT HIGH WHEEL SLIP TO DEVELOP SAFE PLANNING AND DRIVING PROCEDURES AND AID ANY EFFORTS TO EXTRICATE A MER SHOULD IT BECOME BOGGED. WORK UNDER THE AUGMENTATION FUNDING WILL CONTINUE OUR WORK TO IMPROVE THE MODEL PHYSICS AND SPEED OF THE COUPI DEM TO ENABLE MORE DETAILED MODELS OF MER SINGLE AND MULTIPLE WHEEL MOBILITY OVER A WHOLE RANGE OF WHEEL SLIPS RELEVANT TO MER OPERATIONS. THE IMPROVED INFORMATION WILL BE USED TO BUILD A ROVER WHEEL MOBILITY LOOKUP TABLE FOR THE ARTEMIS ROVER MOBILITY MODEL.