Valkyrie and knotted into a ponytail, sometimes bearing drinking horns, have been discovered throughout Scandinavia. These figures are commonly considered to represent valkyries or dísir. According to Mindy MacLeod and Bernard Mees, the amulets appear in Viking Age graves, and were presumably placed there because "they were thought to have protective powers". The Tjängvide image stone from the Baltic island of Gotland, Sweden features a rider on an eight-legged horse, which may be Odin's eight-legged horse Sleipnir, being greeted by a female, which may be a valkyrie at Valhalla. The 11th century runestone U 1163 features a carving of a female
Legged Squad Support System was approximately the shape and size of a horse. A stereo vision system, consisting of a pair of stereo cameras mounted into the 'head' of the robot, was integrated alongside a light detecting and ranging (LIDAR) component in order to enable it to follow a human lead and record intelligence gathered through its camera. The initial contract for the Legged Squad Support System was awarded to Boston Dynamics on December 3, 2009. The continued evolution of the BigDog led to the development of the LS3, also known as AlphaDog. The contract schedule called for an operational demonstration of two units