Legged Squad Support System

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Legged Squad Support System, conceptual design.

The Legged Squad Support System (LS3) is a DARPA project for a legged robot which could function autonomously as a packhorse for a squad of soldiers. Like BigDog, its quadruped predecessor, the LS3 is ruggedized for military use, with the ability to operate in hot, cold, wet, and dirty environments.[1][2]


The Legged Squad Support System is to "Go where dismounts go, do what dismounts do, work among dismounts".[citation needed] The machine is to carry 400 pounds (180 kg) of squad equipment, sense and negotiate terrain, maneuver nimbly, and operate quietly when required.

The LS3 is 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, has been 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.


2012 prototype

The initial contract for the Legged Squad Support System was awarded to Boston Dynamics on December 3, 2009.[3] The continued evolution of the BigDog has led to the development of the LS3, also known as AlphaDog. The contract schedule called for an operational demonstration of two units with troops in 2012.

DARPA, which has continued to support the program, carried out the first outdoor exercise on the latest variation of the LS3 in February 2012, with it successfully demonstrating its full capabilities during a planned hike encompassing tough terrain.

Following its initial success, an 18-month plan was unveiled, which saw DARPA complete the overall development of the system and refine its key capabilities, due to start in summer 2012.[4]

On September 10, 2012, two LS3 prototypes were demonstrated in an outdoor test. One of them had done so earlier in the year. The LS3 prototypes completed trotting and jogging mobility runs, perception visualization demonstrations, and a soldier-bounded autonomy demonstrations. They were roughly "10 times quieter" than the original platform. Other improvements included a 1 to 3 mph walk and trot over rough, rocky terrain, an easy transition to a 5 mph jog, and a 7 mph run over flat surfaces. Testing will continue approximately every quarter at military bases across the country.[5]

In early December 2012, the LS3 performed walks through woods in Fort Pickett, Virginia. These tests were with a human controller giving voice commands to the robot to give it orders. Giving voice commands is seen as a more efficient way of controlling the LS3, because a soldier would be too preoccupied with a joystick and computer screens to focus on a mission. There are currently ten commands that the system can understand. Saying "engine on" activated it, and saying "follow tight" made it walk on the same path as the controller. Saying "follow corridor" made the LS3 generate the path most efficient for itself to follow the human operator. Others include basic orders like "stop" and "engine off." Continued work is being made to make the LS3 more mobile, like traversing a deep snow-covered hill, or avoiding gunfire and bombs on the battlefield. DARPA intends to supply a Marine company with an LS3 by 2014.[6]

From 7-10 October 2013, the LS3 took part in testing, along with other systems, at Fort Benning, Georgia as part of the U.S. Army's Squad Multipurpose Equipment Transport (S-MET) program. The program objective is to find an unmanned robotic platform to transport soldier equipment and charge batteries for their electronic gear. Requirements for the vehicle are to carry 1,000 lb (450 kg) of gear, equal to the amount a nine-man infantry squad would need on a 72-hour mission. Cubic volume is seen as more of a problem for load-carrying unmanned vehicles, as their center of gravity changes when more gear has to be stacked. It has to travel 4 km/h (2.5 mph) for eight hour marches and speed up in bursts of up to 38 km/h (24 mph) for 200 meters. The proposed S-MET vehicle needs to traverse forward and backward on slopes of up to 30 percent and descending on slopes of 60 percent.[7]

The LS3 was used by Marines in July 2014 during RIMPAC 2014. After five years of development, the system had reached a level of maturity for it to operate with Marines from the 3rd Battalion, 3rd Marine Regiment in a realistic combat exercise. One company nicknamed the machine "Cujo" and used it to resupply various platoons in places difficult to reach by all-terrain vehicles. Operators were surprised at the level of stability and reliability it had walking; although it was able to traverse 70-80 percent of terrain, it did have problems negotiating obliques and contours of hills. When it did fall over, the system was able to right itself most of the time, and even when it needed assistance it only required one person because it is designed to be easily rolled upright. Controls, like joysticks, are similar to those for video games, making them simple to learn. Due to loud noise during movement and difficulty traversing certain terrains, the LS3 was used as a logistical tool rather than a tactical one. Further development is continuing on creating more space for equipment, including heavy weapons.[8]


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