The UN Military Staff Committee is a misunderstood organ, and never really worked as it was initially envisaged. This book charts its historic development as a means to explain the continuous debate about the reactivation of the Military Staff Committee and, more generally, the unsatisfied need for the Security Council to have a military advisory body so that it does not only depend on the Secretariat to make its decisions on military and security affairs. The author takes a clear stand for the establishment of a military committee with real weight in the decision-making process of the Security Council related to peace operations. The Security Council remains the only international body making decisions in peace and security, authorizing military deployment without advice from a collective body of military experts and advisers. Recreating such a body is the missing part of all UN reform structures undertaken in past years. As the number of UN troops deployed increases, this book will be an important read for all students and scholars of international organisations, security studies and international relations.