- In this paper, a new scheme for the simulation of tactical communications systems is introduced where the mobility, call and availability patterns for the communications equipment are generated by using the data inferred from the joint theater level battle simulations. In this technique, the mobility, strength and posture data related to military units are stored in a database by a military constructive simulation system during computer-aided exercises. Then, the mobility, call and availability patterns for the communications equipment are derived from these data in the required detail and time resolution by our models. The data structures and the statistical data used in these models, the description of a tactical communications system studied by using our technique, and example results from this study are also presented. Keywords - Military Communications, Tactical Communications, Constructive Simulation, Combat Models, Joint Theater Level Simulation, Highly Aggregated Combat Model...