Twenty years after the fall of the Berlin Wall, NATO stands at a crossroads. Will it reinvent itself yet again, to serve as the foundation for the security and defense of Europe and North America in a world of diverse, non-conventional threats, many of which come from outside of Europe? Will it return to a passive, geographically defined approach of protecting the territory of European Allies against armed attack? Will it merge these visions into a new hybrid? Will it retain the political will and resource commitments of its members, whether in Europe or North America?