CNN reported the US military has received a recent proof of life video of the only living American service member in enemy custody.  SGT Berdahl  reportedly walked off a US combat outpost in Afghanistan without his weapon and body armor in 2009 igniting a frantic search.  During his time in captivity he was promoted twice and has been the subject of a few videos made by his captors.  Last year the Taliban have requested the release of five inmates from the Gitmo detention facility.   Official US policy is not to negotiate with terrorists.  It is suspected he is being held in Pakistan.