Simulation is being expanded well beyond procedure training for individuals and crews to address even greater aspects of training of organizations through the use of distributed simulations. Measuring the contribution of these distributed simulations to organizational training has been difficult. Task performance and teamwork are two general measures that provide insight into the contribution that training in distributed simulation makes toward improving organizational performance. This paper reports findings of a field study of US Army units currently training within the Close Combat Tactical Training distributed simulation system. The research examines unit training within this virtual synthetic environment in terms of improvements in teamwork of the formal unit leaders and, secondly, performance of the unit on common tasks. As a portion of this research, a Navy measure for teamwork was refined for application to this study. Data collected during the field study provides insight into the contribution that distributed simulation may have toward these objectives. The results indicate that statistically significant improvements did occur in specific teamwork behaviors and teamwork dimensions by the unit command and control team. Additionally, statistically significant improvements in unit task performance occurred on specified tasks in the virtual synthetic environment. The implications of the study results and methodology of assessment are discussed in terms of evaluation of distributed virtual simulations for unit command and control teamwork training as well as unit task performance training.