Depends on what the investigation came up with. Abandoning the post is pretty bad in my opinion, and I think deserves being stripped of rank, pay forfeiture, and a dishonorable discharge, because there is no honor in abandoning your post in which others are counting on you to man. But I'm not in the military so I don't know how it works. It doesn't appear that he was sympathetic to the Taliban, and if that's the case then I don't think jail time is necessarily warranted. According to General Dahl, Bergdahl wanted to call attention to what he considered poor leadership of his unit, and believed that that by leaving his post and running the 14 miles to a nearby base he could cause a stir and gain access to a high-ranking officer to complain. So, according to Dahl, Bergdahl didn't abandon his post in sympathy for the enemy, but rather for personal reasons. There is no honor in that.