There exit lots of complex interdependence and communications among decision-making entities because of combat resource entities clustering on task and commander controlling those resource entities to complete combat tasks. Excellent structure of military force should be required to accomplish missions. Military force is composed of two parts: one is collaboration among decision-making nodes of command and control; the other is hierarchy relationship of command among commanders. Military force designing is to optimizing collaboration and hierarchy among commander nodes. In this paper, we set relationship of commander from coordination net among commanders. The optimizing objective is to minimize the overall additional coordination imposed by hierarchy structure among commanders. Algorithms of optimized coordinate tree are employed to generate command relationship in military force.