Foreword - and farewell
This issue of NATO Review, entitled Invocation of Article 5: five years on, examines the significance and consequences of NATO's decision on 12 September 2001 to invoke the Alliance's collective-defence clause for the first time. It is also the last issue that I will be editing. By the time it goes live, I will be on a leave of absence in Sarajevo, Bosnia and Herzegovina, working as communications director of the Office of the High Representative. The move to Sarajevo effectively brings my career full circle since I spent much of the 1990s either in the former Yugoslavia or writing about events there. Indeed, I decided to join NATO because I believed in the Alliance as a result of what it had achieved in the former Yugoslavia and especially in Bosnia and Herzegovina.

NATO Review is a unique institution and it has been a pleasure and a privilege to edit it. It is unique because, although published by NATO, its raison d'ętre is to be a forum for debate. Hence the wide range of views represented in its pages. When former NATO Secretary General Paul-Henri Spaak created NATO Review in 1959, he did so because he believed in the power of ideas, the importance of debate in decision-making, and the benefits of critical analysis. Nearly half a century later, the Euro-Atlantic security environment has changed beyond recognition. But the need for fresh ideas, for open discussion and quality research is greater than ever. Hence the enduring relevance of NATO Review and its importance to the Alliance.

My six years at NATO Review have coincided with a remarkable period in Alliance history. Events that stand out include the trials and tribulations of peacekeeping in the former Yugoslavia; preventive intervention in the former Yugoslav Republic of Macedonia;* the invocation of Article 5; the Alliance's post-9/11 transformation; the second post-Cold War round of enlargement; discord over Iraq; and NATO's subsequent engagement beyond the Euro-Atlantic area. Moreover, the pace of change is ever increasing. In addressing these and other issues, the publishing team and I have sought at all times to live up to NATO Review's mission statement, namely to contribute to constructive discussion of Atlantic issues.

In the first of four articles devoted to this issue's central theme, Sebestyén L. v. Gorka of the Institute for Transitional Democracy and International Security in Budapest analyses the significance of the invocation of Article 5. Edgar Buckley, former NATO Assistant Secretary General for Defence Planning and Operations, describes how NATO invoked Article 5 on 12 September 2001. Tomas Valasek, until recently director of the World Security Institute in Brussels, examines evolving attitudes to collective defence at NATO. And author Stanley R. Sloan analyses the debate over Article 5 that dominated the Washington Treaty negotiations.

In the debate, Rafael L. Bardají of the Fundación para el Análisis y los Estudios Sociales in Madrid and Daniel Keohane of the Centre for European Reform in London discuss whether homeland security should be a fundamental NATO mission. In the interview, Hikmet Çetin, NATO's Senior Civilian Representative for Afghanistan, assesses the challenges facing the NATO-led International Security Assistance Force as it expands its operations into the south of Afghanistan. Elsewhere, Captain Keith J. Allred from the Judge Advocate General's Corps, US Navy, examines NATO policy on countering human trafficking. And Stephan De Spiegeleire and Rem Korteweg of the Clingendael Centre for Strategic Studies in The Hague consider a variety of scenarios for the Alliance's future.