The work presented in this contribution demonstrates the results of the verification and validation efforts of simulation versus test of the mobility of a light tactical vehicle, the Fuel Efficiency Demonstrator, FED-Alpha. The simulations are the contribution to the Cooperate Demonstration of Technology (CDT) of Next Generation NATO Reference Mobility Model as performed by the Aarhus University (AU) team using Jet Propulsion Laboratory’s (JPL) ROver Analysis, Modeling and Analysis Software ROAMS. The work demonstrates hard surface automotive tests as well as soft soil tire-terrain terramechanics tests such as drawbar pull on fine and coarse grained soils and a variable sand slope test on coarse grained soil. Furthermore, a traverse of mixed terrain types and the results of a developed off-road driver model are shown as a demonstrator of Next-Generation NATO Reference Mobility Model simulation capability.