On March 26,2019, Vice President Mike Pence directed NASA to return humans to the surface of the moon by 2024. In response, NASA is working with industry to develop a Human Landing System (HLS) to transfer two crew from an orbiting platform in high Lunar Orbit down to the lunar surface and back. This paper presents architecture trade study results from the Aerojet Rocketdyne (AR) NextSTEP-2 Appendix E: Human Landing System Studies, Risk Reduction, Development, and Demons tration contract with NASA. This architecture trade study includes an examination of a range of HLS configurations, launch vehicle options, concept-of-operations (CONOPS) options, main propulsion options, and other subs ystem design options. Cost, schedule, reliability, extensibility, and performance attributes were assessed for each HLS architecture option analyzed. Each HLS architecture option was scored based on these attribute results utilizing the utility analysis methodology. High scoring options were further studied with alternate attribute weightings and Monte Carlo uncertainty analyses.
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