Petraeus retires from US military ahead of CIA post

31 August 2011 Last updated at 17:42 ET Help

Gen David Petraeus, the former US commander of Nato troops in Afghanistan, has formally retired from the armed forces as he prepares to take over as CIA director.

Gen Petraeus oversaw last year's surge of US troops to Afghanistan before handing over to Gen John Allen in July.

Mark Mardell reports.

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