The Green Propellant Infusion Mission (GPIM) is a planned NASA technology demonstrator project that will test a high-performance, high-efficiency alternative to conventional chemical propulsion systems for next-generation launch vehicles and spacecraft. The fuel may offer many advantages for future satellites, including longer mission durations, additional maneuverability, increased payload space and simplified launch processing.The GPIM is managed by NASA's Marshall Space Flight Center in Huntsville, Alabama, and is part of NASA's Technology Demonstration Mission Program within the Space Technology Mission Directorate.