DARPA’s Ground X-Vehicle Technologies (GXV-T) program aims to improve mobility, survivability, safety, and effectiveness of future combat vehicles without adding heavy armor. One particularly cool idea is the Reconfigurable Wheel-Track (RWT), which can combine the traction benefits of a track with the speed benefits of a tire – all in one unit. All the GXV-T technologies are worth seeing, but you can skip to 2:20 to go straight to the RWT content.