Completed NASA Game Changing Development project led by Glenn Research Center to develop and demonstrate an air-independent solid-oxide fuel-cell stack that generates power directly from CH4/LOX propellants and in-situ resources for lunar surface applications. Precision Combustion, Inc. performed stack-level testing and system-level trade studies with NASA partners, addressing thermal management, vacuum and vibration tolerance, contamination tolerance, reusable operation, and turnkey controls and packaging for sustainable surface power.