LS3 Testing in Desert
http://www.youtube.com/watch?v=LJZQ3n-iQYE
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
WildCat
http://www.youtube.com/watch?v=wE3fmFTtP9g
WildCat is a four-legged robot being developed to run fast on all types of terrain. So far WildCat has run at about 16 mph on flat terrain using bounding and galloping gaits