A Distributed Interactive Intelligent Tutoring Simulation (DIITS) has been developed to train Army Infantry squad and fire team leaders skills to perform military operations cooperatively in urban terrain. It integrates distributed interactive simulation (DIS) and intelligent tutoring systems (ITSs) and thus capitalizes on the strengths of both: the ability to conduct large-scale team exercises while providing each trainee with personalized instruction. The simulation-based intelligent tutoring system developed has three components: the simulator that allows a trainee to assume the role of a fire team leader and direct a four-man fire team in the task of clearing a building; the intelligent tutor that assesses the trainee actions in the simulator, determines whether corrective instruction is needed, and directs the simulator to provide such instruction; and the generic integrated knowledge structure (INKS) that serves as the expert problem solving model. A distributed interactive intelligent tutoring simulation (DIITS) has been created by integrated the approaches offered by the ITS and simulation communities, an enhanced paradigm of realistic DIS scenarios, coupled with the instructional benefits of ITS technology. Another demonstration completely reused the project technology and even enhanced it (knowledge was added to the INKS), with the exception of the virtual simulator. It included a scenario editor that allows users to enter their own scenarios. (YLB)