Desert Storm has clearly demonstrated the growing reliance on geographically separated, multi-service teams who are called upon to execute specific missions. Future conflicts can similarly be expected to require close coordination between teams from different services. Fortunately, advances in distributed interactive simulation (DIS) technology are paving the way for members of different commands and different services to simultaneously come together to fight a simulated war on a synthetic battlefield. While advancements in simulation and networking technologies hold great promise for training applications, little is known about how multi-service teams perform in a DIS environment. The Multi-Service Distributed Training Testbed (MDT2) was recently used in one of the first tryouts of DIS technology for training personnel from all services in multi-service Close Air Support (CAS). The MDT2 exercises represented a unique opportunity to systematically collect multi-service team performance data in a DIS training environment. The team performance data were collected during a 4-day series of exercises conducted in May 1994 and from a 5-day series of exercises conducted in February 1995. This paper describes one of the techniques used for the team performance measurement, presents trends in the data, delineates the lessons learned, and provides recommendations for evaluating team performance and mission effectiveness in DIS training environments.