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CJ Chivers is an author, a journalist and a former US marine. He has spent a lot of time writing about the wars in Iraq and Afghanistan. In his new book ‘The Fighters’, Chivers describes how these wars are taking a toll on the soldiers who have fought in combat operations which now span nearly two decades. (A US soldier investigates the scene of a suicide attack at the Afghan-Pakistan border crossing in Torkham, Nangarhar province. Credit: Noorullah Shirzada/Getty Images)