Abstract
In the military system, the simulation represents the most important tool to support training because it can be efficiently used from the tactical level up to the strategic level. For individual training the costs of using real or virtual simulation systems are not justified, but when it comes to the headquarters training, running a live exercise is extremely expensive. Nevertheless, the units, headquarters, general staff and Multinational Division South-East Headquarters need to be trained in both national and NATO exercises. Taking those facts into consideration, computer assisted exercises proved to be the best solution for training all the cycles within a headquarters that support the decision making process. In the last years, among all those processes, a particular interest was shown for the functional area services interoperability during NATO computer assisted exercises.