To fix the robots. Moon dust is evil -- unweathered, sharp, and electrostatically suspended in clouds due to solar wind charging it up. Until robots get good at

To fix the robots. Moon dust is evil -- unweathered, sharp, and electrostatically suspended in clouds due to solar wind charging it up. Until robots get good at repair work, some poor humans are probably going to get stuck with this job. To do repacking/refueling logistics for more ambitious manned missions. To unpack and deploy infrastructure. To shoot at people who try to jack the infrastructure :)