In recent years questions of ethical responsibility and justice in war have become increasingly significant in international relations. This focus has been precipitated by United States (U.S.) led invasions in Afghanistan and Iraq. In turn, Western conceptions of ethical responsibility have been largely informed by human rights based understandings of morality. This book directly addresses the question of what it means to act ethically in times of war by drawing upon first-hand accounts of U.S. war fighting in Iraq during the 2003 invasion and occupation. The book focuses upon the prominent rights based justification of war of Michael Walzer. Through an in-depth critical reading of Walzer’s work, this title demonstrates the broader problems implicit to human rights based justifications of war and elucidates an alternative account of ethical responsibility: ethics as response . Putting forward a compelling case for people to remain troubled and engaged with questions of ethical responsibility in war, this work will be of great interest to students and scholars in a range of areas including international relations theory, ethics and security studies.