The challenge for training in the next decade is networking combat vehicle simulators to allow low-cost simulation of platoon, company, and battalion-level exercises incorporating the tactical, logistics, and communications elements critical to real field operations. This paper describes a DARPA-sponsored advanced research project to interconnect manned, microcomputer-based combat vehicle simulators on a common network. A real-time computer image generation system in each simulator provides a multi-window view of the simulated battlefield, with all other combat vehicles shown at the positions and orientations determined by the cumulative control inputs of their crews. Each simulator on this simulation network has a microcomputer capable of processing all the messages (data packets) it receives from other simulators, as well as sending all the necessary data packets on its state to other simulators. Without any special simulator instrumentation, these data packets provide the capability to monitor an exercise in real time (as it actually happens). They can also be recorded and used later for after-action review. Other Data Collection and Analysis capabilities allow generation of measures of crew and unit performance in the exercise, as well as measures of training effectiveness.