According to DARPA’s website “the goal of the Orbital Express Space Operations Architecture program is to validate the technical feasibility of robotic, autonomous onorbit refueling and reconfiguration of satellites to support a broad range of future U.S. national security and commercial space programs. Refueling satellites will enable frequent maneuver to improve coverage, change arrival times to counter denial and deception and improve survivability, as well as extend satellite lifetime. Electronics upgrades on-orbit can provide regular performance improvements and dramatically reduce the time to deploy new technology on-orbit.”
Via Defence Tech.