The Energetically Autonomous Tactical Robot (EATR) will consume biomass for energy consumption. Robotic Technology Inc., based in Maryland, has developed this robot to survive without refueling and servicing for years.
The engine powering the EATR is called the Waste Heat Engine. This engine acts a lot like a steam-powered engine in that it burns fuel and causes water to cycle through and generate electricity.
The various applications of the robot include, but definitely are not limited to: ambulances, offensive vehicles, communications, and recon. The Pentagon is researching the various applications that can be used on this robot's platform.