Mission rehearsal can be defined as the use of accurate, correlated data bases, generated or updated rapidly from a variety of sources, to simulate a mission exactly as it will be executed. While this operational definition of mission rehearsal is relatively straightforward, its implementation is not. Incomplete or incompatible data, as well as limitations in state-of-the-art data base processing and multi-sensor correlation, currently inhibit the implementation of mission rehearsal in its truest sense. The ability of data base tools and current processing techniques to comply with mission rehearsal requirements must be assessed. This paper discusses the definition of mission rehearsal, describes current data base processing techniques, and identifies the subset of mission rehearsal that reflects the current abilities and limitations in correlating visual-image and other sensor simulators. Strategies are proposed for closing the gap between current and desired capabilities.