Vehicle design today takes longer than it ever has in the past largely due to the abundance of requirements, standards, and new design techniques; this trend is not likely to change any time soon. This paper and presentation will explore how advancements in gaming engines can be leveraged to bring realistic visualization and virtual prototypes to the beginning of the design cycle, integrate subsystems earlier in the design, provide advanced simulation capabilities, and ensure that the final design not only meets the requirements but is fully vetted by stakeholders and meets the needs of the platform. The Unreal Engine can be used to bring this and more to vehicle designs to reduce design churn and bring better products to market faster. In my presentation I will show examples of how we are leveraging simulations to inform our design decisions earlier in the design process starting from concept through the full life cycle. By simulating the Concept of Operations (from model based systems engineering) the simulation allows engineers, managers, and stakeholders to experience the design before critical decisions are locked in. I will also briefly touch on how this enables a agile development approach to complex mechanical systems. This presentation is based the award winning paper: A. Diepen, O. Vazquez, A. Black, C. Gaff “Leveraging Simulation Tools to Accelerate Design,” In Proceedings of the Ground Vehicle Systems Engineering and Technology Symposium (GVSETS), NDIA, Novi, MI, Aug. 16-18, 2022.