The Robotic Refueling Mission (RRM), Brought up to the International Space Station on STS-135, began operations on the 7th March.
RRM is an external station experiment designed to demonstrate the technologies, tools, and techniques needed to robotically service and refuel satellites in orbit, especially those not built with servicing in mind. RRM represents the first time the space station's Dextre robot is used for technology research and development, moving it beyond robotic maintenance of the orbiting superstructure.