This book delivers on two analytical levels. First, it is a broad study of Sweden as an international actor, an actor that at least for a brief period tried to play a different international role than that to which it was accustomed. Second, the book problematizes the role of international military missions as drivers for change in the security and defence field. Several perspectives and levels of analysis are covered, from the macro level of strategic discourse to the micro level of the experiences of individual commanders. The book focuses upon Sweden and its participation in the international military mission in Afghanistan during 2002-2012 and also contributes to the growing literature evaluating the mission in Afghanistan, the security practice which has dominated the security and defence discourse of Western Europe for the last decade.