The Legged Squad Support System (LS3) was a DARPA project for a legged robot which could function autonomously as a packhorse for a squad of soldiers or marines. LS3 demonstrated that a highly mobile, semi-autonomous legged robot could carry 400 lbs of a squad’s load, follow squad members through rugged terrain and interact with troops in a natural way, similar to a trained animal and its handler.
The LS3 program goal was to develop a robot that could go through the same terrain the squad goes through without hindering the squad’s mission. The robot could also serve as a mobile auxiliary power source to the squad, so troops could recharge batteries for radios and handheld devices while on patrol.