The command module is the Apollo spacecraft we're familiar with. It's the gumdrop-shaped vehicle that served as the crew’s main quarters throughout the mission; the commander and lunar module pilot, of course, descended to the Moon’s surface in the lunar module. But it was small, just 10 feet 7 inches tall and 12 feet 10 inches in diameter. And even that small volume was divided into three sections. There was a forward compartment that served as the docking site with the lunar module, an area around the base that housed the reaction control system and all the related wiring and plumbing, and finally the main crew quarters that gave three men just 210 cubic feet of living space. But from this spacecraft the crew ran almost every aspect of the mission. Again, the exception was the lunar landing.