They are perhaps best known for having piloted the internet and technologies around it in collaboration with University of California at Berkeley (who they often collaborate with).
They are currently funding the Bleex project and other defence projects.
They the central research and development organization for the US Department of Defense (DoD).
At the moment - they are also running the DARPA Grand Challenge.
They are at the forefront of some very interesting robotic research.
Time to build your own robot! Using a Raspberry Pi with parts and some time, you can use my book to learn how to make and program a robot with automatic behaviours.