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What we’re really doing at the Mars Desert Research Station is what we call an operational simulation more than a technical engineering simulation, but we find out how you would run a mission on Mars, so for example what we’ve discovered by running it a number of ways is the mission has got to be led from the front, that is, the commander of the mission is the commander of the crew. We don’t even call our mission control mission control anymore we call it mission support - they are there to support the crew - this has got to be led from the front.