Legged Squad Support System (LS3) is a four-legged robot designed to travel 20 miles on rough terrain carrying 400 lbs of load. The video shows field testing at Twentynine Palms, CA. Testing includes rough-terrain mobility, endurance, visually guided following, GPS guided maneuver, and overall reliability. LS3 is being developed by Boston Dynamics with funding from DARPA and the US Marine Corps. Source