Robots and other unmanned systems will play many critical roles in support of a human presence on Mars, including
surveying candidate landing sites, locating ice and mineral resources, establishing power and other infrastructure,
performing construction tasks, and transporting equipment and supplies. Many of these systems will require much more
strength and power than exploration rovers. The presence of humans on Mars will permit proactive maintenance and
repair, and allow teleoperation and operator intervention, supporting multiple dynamic levels of autonomy, so the critical
challenges to the use of unmanned systems will occur before humans arrive on Mars. Nevertheless, installed
communications and navigation infrastructure should be able to support structured and/or repetitive operations (such as
excavation, drilling, or construction) within a "familiar" area with an acceptable level of remote operator intervention.
This paper discusses some of the factors involved in developing and deploying unmanned systems to make humans' time
on Mars safer and more productive, efficient, and enjoyable.