Over the past twenty years, Private Military and Security Companies (PMSCs) have become significant elements of national security arrangements, assuming many of the functions that have traditionally been undertaken by state armies. Given the centrality of control over the use of coercive force to the functioning and identity of the modern state, and to international order, these developments clearly are of great practical and conceptual interest.

This edited volume provides an interdisciplinary overview of PMSCs: what they are, why they have emerged in their current form, how they...