The NESC released benchmark Earth-based check-cases in 2015 to promote consistent and accurate flight simulations for 6DOF aero/spacecraft models.Recently, the NESC expanded this effort to include Lunar-based check-cases to support new lunar exploration initiatives.The check-cases provide a measure of validation for simulations supporting Human Landing Systems.Utilizing benchmarking check-cases improves simulations, reduces errors, and builds confidence in solutions.