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A new “business model” for African defence ministries is taking shape.

  THE north-eastern Nigerian town of Chibok is spared little. Earlier this year fighters from the extremist group, Boko Haram, abducted more than 200 local schoolgirls. In the past week insurgents and government troops have traded possession of urban districts and surrounding farmland, leaving much of it burnt. The Nigerian army, one of the biggest…