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This study examines the lunar environment, the lunar rover mission, and the factors that influence EMU walkback range in the event of a rover failure many kilometers from base. A heuristic method to estimate walkback range of EVA astronauts is presented. An attempt is made to quantify the EVA walkback factors that influence the total walkback range of the lunar EVA astronaut given a fixed duration of the EMU. A walkback range estimate can then be used to carefully structure EVA missions and will help in future designs of EMUs.