Change is apparent in all walks of life, and military training requirements are no exception. This is a challenge and a tremendous opportunity. The Defense Advanced Research Projects Agency (DARPA) is meeting this challenge through its Synthetic Theater of War (STOW) program. It is working to solve the difficult simulation problems for training and mission rehearsal and providing the user community an unparalleled opportunity to shape the training environment of the next century. This paper will cover STOW's progress to date on applying R&D for the operational community and DARPA's near-term interactions with its sponsor, the U.S. Atlantic Command (USACOM).