This report describes current work progress on weapon system model development for ground combat. The weapon system model is structured to contain sub-models on weapons, protection and movement. These sub-models contain attributes that are specific for the system at hand. This model structure is exemplified by applying it to a tank and an anti armour guided missile system. The work in progress on hit probability model of a guided weapon and the dynamics model for a fighting vehicles is also described. The hit probability model is general and describes how the probability is effected by the seekers field of view, targets signature adaptation, targets movement and whether the target applies protective smoke and decoys. A plan for continued work on the development of weapon system models is presented.