This New York Times article describes the Multimedia Intelligent Network of Unattended Mobile Agents, or Minuteman, project, which is figuring out how the military can achieve its dream of a battlefield filled with swarms of autonomous vehicles in the air and on the ground.

This is a Global Hawk, which can fly more 60,000 feet over the battlefield for over 40 hours (it was first deployed in Afghanistan, and was the first UAV to fly non-stop over the pacific), and may be used to provide a communications umbrella over fleets of smaller vehicles: