Tomorrow's state-of-the-art training systems will be networks of high-fidelity simulators coupled to provide aviator crews with advanced training as players in combined-arms teams. In addition networked simulators will provide crews with an advanced facility to exercise and enhance their air-to-air skills by allowing combat against equally trained crews in a hostile environment. To reach such training levels, tomorrow's simulators can be specified to incorporate designed-in network interfaces and system-to-system compatibility. There is, however, an alternative to waiting for the development of next generation simulators. Today's alternative is to develop interfaces to network simulators which are currently fielded or scheduled for fielding in the near future. The Multiple Simulator Networking Program (MULTISIM) is a research effort which has provided proof-of-concept for this alternative. This paper describes the MULTISIM prototype, the missions performed, and insight gained relative to the potential of networking to change current concepts of overall combat training.