The Dismounted Infantry Virtual After Action Review System (DIVAARS) is one component of a research program to develop effective Virtual Environment (VE) training techniques for dismounted Infantry leaders, soldiers, and units. This paper describes the development of the system, the conduct of the soldier evaluations, and the resulting system enhancements. DIVAARS is designed to provide trainees with a common understanding of what happened during an exercise and why it happened, so that they can identify ways to improve their performance, and to facilitate data analysis and presentation to support both training feedback and research and development. Determining what happened during an exercise is particularly difficult in urban terrain, where buildings limit the portion of the battlefield that can be observed by any one person. DIVAARS software runs on a Linux platform and can be hosted on a Pentium III PC. Key capabilities of the system are: digital videodisc (DVD)-like replay with synchronized audio and video, the capability to mark times and views during an exercise and jump to them during the AAR, and tabular and graphic data summaries. Several features are especially useful for exercises conducted in urban terrain: interiors of individual floors of multi-story buildings can be selected for viewing, individual soldiers can be identified, and visual traces of their movements can be presented. An evaluation of the system was conducted at the Dismounted BattleSpace BattleLab, Fort Benning, GA. Squads composed of Infantry soldiers and computer-generated forces conducted exercises in VE models of the Shughart Gordon enclave over a 5-day period. Questionnaires and interviews were used to evaluate the system. The system was rated positively. Several areas for enhancements were identified and implemented.