Potentially one of the most significant applications of today's simulator technology is the employment of advanced training systems to accomplish mission rehearsals. The initial challenge in this pursuit has been finding an acceptable definition for the term "mission rehearsal." Until recently, available literature on mission rehearsal provided a diverse and often inconsistent and confusing collection of definitions and terminology. However, in 1989 a paper was published which offered concise definitions of mission preparation, mission preview, combat mission training, and mission rehearsal. With these definitions, concepts relating to the performance of mission rehearsals can be considered. Furthermore, the interaction of the subfunctions of preview, preparation, and mission training and how they support the end result can be analyzed. Pursuing this analysis, however; quickly leads to the realization that it is counterproductive for the military to consider mission rehearsal as a stand-alone function. This assessment is further supported by studies of mission training and rehearsal concepts employed in the space program. Accordingly, this paper-recommends an integrated mission training rehearsal program to effectively and efficiently prepare our aviation crews for today's complex military missions.