Military and police forces play a crucial role in the long-term success of political, economic and cultural rebuilding efforts in post-conflict societies. Yet, while charged with the long-term task of providing a security environment conducive to rebuilding wartorn societies, internal security structures tend to lack civilian and democratic control, internal cohesion and effectiveness, and public credibility. This book draws upon the experiences and analyses of an international group of academics and practitioners, many of whom have direct experiences with SSR programmes. They examine the role of external actors, as well as their interactions, in meeting the challenge of sustainable post-conflict SSR. A wide variety of case studies from Europe, Africa, Asia and Latin America put these discussions into regional and global contexts. Case countries include: Macedonia, Bosnia, Russia, Georgia, Northern Ireland, El Salvador, Guatemala, Colombia, Chile, Haiti, Cambodia, East Timor, Afghanistan.