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Advanced space suit mobility studies were successfully conducted during the period of May 2-17, 1998, under representative Lunar and Mars-like terrain conditions at remote field site locations in the Flagstaff, Arizona, area. The sites visited included Cinder Lake, a volcanic ash area that was an actual Apollo-era test site with simulated craters developed by the United States Geological Survey (USGS); SP Mountain, an area that contained a young lava field with extensive rock rubble; Grand Falls, a canyon area that contained a variety of rock outcroppings, volcanic ash, and rock rubble; and Meteor Crater, a young impact crater area that contained various slopes with loose rock rubble. The test activities were supported by a team of JSC personnel utilizing the MK III advanced space suit technology demonstrator suit and a NASA modified commercial liquid air backpack system. The suit test subject was Dr. Dean Eppler, a trained field geologist.