The vehicle simulation community has recognized the need for a simulator that can be used to train military personnel on different vehicle configurations while utilizing the same simulator platform. Lockheed Martin Information Systems (LMIS) has responded to the market by developing the Lockheed Martin Reconfigurable Simulator (LMRS). The LMRS design utilizes a unique hardware and software approach that provides for an open, scaleable, reconfigurable system architecture for simulation applications. This paper addresses the reconfigurable software system architecture developed for the LMRS system.