DARPA's  Robotic Servicing of Geosynchronous Satellites (RSGS) program, features a payload developed by the U.S. Naval Research Laboratory.  Credit: NRL
SSL satellite servicing concept
SSL satellite servicing concept
DARPA's RSGS program aims to take satellite-servicing technologies tested on the ground into orbit in 2020 to 2021 for a full-up demo. Credit: DARPA