The Modern Mercenary: Private Armies and What They Mean for World Order. By Sean McFate.Oxford University Press; 248 pages; $29.95 and £19.99. Buy from Amazon.com; Amazon.co.uk

IN THE pirate-infested waters off the coast of Somalia around 180 private military contractors from 35 countries work to protect international shipping. They cost as little as a tenth of the official protection provided by the governments of France, Holland and Spain. Yet they can deploy lethal force and have proved very effective; they have even formed an industry group, the Security Association for the

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