Frequently characterized as either mercenaries in modern guise or the market's response to a security vaccuum, private military companies are commercial firms offering military services ranging from combat and military training and advice to logistical support, and which play an increasingly important role in armed conflicts, UN peace operations, and providing security in unstable states. This work analyzes the current legal framework and the needs and possibilities for regulation in the years ahead, organized around four sets of questions, which are reflected in the four parts of the book....