That is the Lockheed Martin Multifunction Utility/Logistics and Equipment (MULE) vehicle. The MULE is a 2.5-ton Unmanned Ground Vehicle (UGV) designed to be able to support dismounted and air assault operations. It consists of four major components:
1. Common Mobility Platform (CMP)
2. One of three Mission Equipment Packages:
Multifunctional Utility/Logistics and Equipment-Transport (MULE-T),
Multifunctional Utility/Logistics and Equipment-Counter Mine (MULE-CM)
Armed Robotic Vehicle-Assault Light (ARV-A-L) - the one in the picture above.
3. Centralized Controller (CC) for Dismounted operations
4. Autonomous Navigation System (ANS) mission payload package integrated on the MULE platforms and Manned Ground Vehicles (MGVs) to provide semiautonomous and leader-follower capability.
The XM1217 Transport MULE Vehicle (MULE-T) will carry 1,900-2,400 pounds of equipment and rucksacks for dismounted infantry squads with the mobility needed to follow squads in complex terrain.
The XM1218 Counter Mine MULE Vehicle (MULE-CM) will provide the capability to detect, mark and neutralize anti-tank mines by integrating a mine detection mission equipment package from the Ground Standoff Mine Detection System (GSTAMIDS) FCS (BCT) program.
The XM1219 ARV-A-L MULE Vehicle is a mobility platform with integrated weapons; an M240 7.62mm machinegun, four Javelin guided antitank missiles, and reconnaissance, surveillance and target acquisition (RSTA) package to support the dismounted infantry’s efforts to locate and destroy enemy platforms and positions.
The wheels have electric motors in each wheel as explained in the video below: