The authors examine the trends in the strategic environment in their development of the Future War/Future Battlespace. One fact is clear. Traditional warfighting has changed in the post 9-11 era. The U.S. military must adapt or fail. There is no other recourse. The authors have superbly framed the strategic environment into four strategic battlespaces and have examined the ways future adversaries will operate within them to thwart U.S. strategic initiatives. In this context, these variables influence the path that Transformation must take.