Crew 21 was fortunate to be at MDRS for two historic events sure to shape our future on Mars. We arrived here on the same day that Spirit arrived at Gusev Crater. The following week, just as Spirit rolled onto the regolith of Mars for the first time, President Bush announced a major new space initiative that promises, if fulfilled, a human presence on Mars within our lifetimes. We came to MDRS with an ambitious set of projects, a small step perhaps, toward the goal of getting humans to Mars. We accomplished most of what we set out to do, while achieving a relatively rigorous sim, albeit for a shorter time than we had anticipated. The following is a brief summary of the results obtained during our rotation.