Armored vehicles like tanks and Humvees are not exactly renowned for their agility. Its Defense Advanced Research Projects Agency (DARPA), the same agency whose research led to the development of the internet, has for the past few years been working on a program to build new types of armored vehicles that are both stronger and lighter than current options — all the better to avoid enemy rocket fire. As it turns out, DARPA believes the resulting vehicles will probably look like giant ATVs, similar to the Warthog, the fictional reconnaissance vehicle from the Halo series of video games.