This book explores the question of why a significant difference in the frequency and intensity with which Great Britain and Germany used military force since 1990 persists despite reunification and the end of the Cold War. Based on the theoretical framework of moderate constructivism, this thesis argues that differences in strategic culture can explain this puzzle. To this end, it analyses opinion polls and military interventions abroad and then compares decision processes and debates leading to military interventions in Kosovo, Sierra Leone, the Democratic Republic of Congo and Afghanistan.