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• NG-NRMM software tools will integrate state-of-the-art 3D large soil deformation/flow terramechanics models and vehicle multibody dynamnic models in order to predict ground vehicle mobility on any given terrain. • The requirements for NG-NRMM macro-scale complex terramechanics models are presented. • A prototype software tool which satisfies the NG-NRMM requirements is presented. In part 2 of this paper, the Complex Terramechanics (CT) software tools requirements recommended by the NATO research task group RTG-248 are presented along with example simulations from a CT prototype software tool which attempts to satisfy the requirements. [ABSTRACT FROM AUTHOR]

• An overview of the spectrum of vehicle mobility terramechanics models is presented. • A literature review of macro-scale vehicle mobility terramechanics models is presented. • The requirements for NG-NRMM macro-scale terramechanics models are presented. • A prototype software tool which satisfies the NG-NRMM requirements is presented. The US army along with NATO member and partner nations' militaries need an accurate software tool for predicting ground vehicle mobility (such as speed-made-good and fuel-consumption) on world-wide terrains where military vehicles may be required to operate. Currently, the NATO Reference Mobility Model (NRMM) is the only NATO recognized tool for assessing ground vehicle mobility. NRMM was developed from the 1960s to the 1980s and relies on steady-state empirical formulas which may not be accurate for new military ground vehicles. A NATO research task group (RTG-248) was established from 2016 to 2018 to develop the NG-NRMM (next-generation NRMM) software tool requirements and an NG-NRMM prototype which uses high-fidelity "simple" or "complex" terramechanics models for the terrain/soil along with modern 3D multibody dynamics software tools for modeling the vehicle. NG-NRMM Complex Terramechanics (CT) models are those that utilize full 3D soil models capable of predicting the 3D soil reaction forces on the vehicle surfaces (including tires, tracks, legs, and under body) and the 3D flow and deformation of the soil including both elastic and plastic deformation under any 3D loading condition. In Part 1 of this paper, an overview of the full spectrum of terramechanics models from the highest fidelity to the lowest fidelity is presented along with a literature review of CT ground vehicle mobility models. [ABSTRACT FROM AUTHOR]