Human body modeling efforts for the purpose of Soldier protection need to address the current threats as well as have a vision for the future. Modeling the human body is a challenging endeavor due to its geometric complexity, numerous interacting layers, rich anisotropy, and wide variability. Developing a model for predictive injury capability, therefore, needs to be versatile and flexible to address different levels of modeling complexity. The vision presented here surrounds a flexible mixand- match assembly approach. This assembly process has the capability to take a collection of source body part meshes that may have different resolutions, deform the meshes based on the individual to be simulated, and posture them into different positions so that the end result can be exported into multiple finite element solvers. The primary focus of the present effort is the mounted Soldier???s response to accelerative loading from underbody blast events. Many of the challenges in modeling the human body remain the same for applications such as the response of dismounted Soldiers. This report presents a progress report of our current efforts and documents some major improvements to the lower leg model with a vision of the future in mind. We also introduce significant details regarding an assembly architecture that is currently under development.