D3 is an independent, smart rocket motor optimized for decommissioning maneuvers. Installed on satellites before launch, D3 can be activated from the ground even if the main spacecraft bus is unresponsive to perform a quick, safe, and direct disposal maneuver at end-of-life or in case of a major failure. D3 is fully compliant with international space debris regulations, enabling operators of constellations to maintain their operational orbits free from uncontrolled satellites, and reducing collision risk. Depending on the configuration, D3 can perform quick re-entry for LEO satellites, re-orbiting to graveyard orbit for MEO and GEO satellites.