Wow. The Taliban claim to have him:

An American soldier has been captured by insurgents in Afghanistan, the first to be taken prisoner since the US-led invasion of 2001.

The US military refused to confirm details but a commander of the Taleban's hardline Haqqani faction said that his men had captured the soldier in the southeastern Paktika province, which borders Pakistan.

“One of our commanders named Mawlawi Sangin has captured a coalition soldier along with his three Afghan guards in Yousuf Khail district of Paktika province,” the commander, named only Bahram, told the AFP news agency.