Private Bowe Bergdahl, 24, has converted to Islam and adopted the Muslim name Abdullah, according to his captors.
But he appeared without a beard in the latest footage and is seen with a quite significant wound on his left cheek.
The serviceman is looking thin but otherwise healthy alongside Taliban commander Maulawi Sangin who has previously threatened to kill him.
Bowe Bergdahl Is Alive
It remains unclear how when the video was shot or where he is being held.
Pte Bergdahl disappeared in June 2009 while on duty in the eastern part of the country when he was aged 23 and is thought to be the only U.S. soldier in captivity.
Spokesman Lieutenant Colonel Timothy Marsano confirmed the serviceman's family had seen the new video and said it was him.
The footage lasts for almost 45 minutes and Bergdahl can be seen wearing an open-necked tan shirt and has a significant wound just below his left eye.
But unlike in the three previous releases he is not the main subject of the video.
According to his captors the Private has reportedly given Taliban insurgents training in bomb-making and ambush skills.
Bowe Bergdahl Is Alive
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