The purpose of the robot is obvious, to serve as a pack mule. Analysts at war colleges have known since studying the conquests of Alexander that the average fighting man can carry between 40 to 60 pounds, the heavier the less easily, and always as an encumbrance.
The robot's name is LS3, which is an acronym for Legged Squad Support System. To quote ""The vision for LS3 is to combine the capabilities of a pack mule with the intelligence of a trained animal," Army Lt. Col. Joe Hitt, DARPA's LS3 program manager, said in a written statement. Each robot carried a 325-pound load during the demonstration, Hitt told InformationWeek in an email."
I am however mindful of what Alexander did at the outset of when he was leading his army across the Khyber Pass into India, he burnt his wagons, because he realized that the trains were a hindrance.
I am also not sure how I would feel if I saw one of those robots in the real world.