The U.S. military has tapped a two-star general to investigate the circumstances surrounding the disappearance of Army Sergeant Bowe Bergdahl in 2009. Bergdahl is undergoing medical treatment in Texas after returning to United States last week following five years in Taliban captivity. An Army psychologist said his reintegration in society could take time.

Col. Bradley Kamrowski-Poppen: “I would love to tell you it’s going to be a certain amount of time. The reality is, we don’t know. There is no average time of reintegration. Each case is unique and different. I think this case is particularly unique for its length, over five years. And again, we know that he did not have any contact with U.S. servicemembers during captivity. He did not have a chance to have fellowship overall. So, it will proceed at his pace.”

An earlier military report found Bergdahl likely walked away from his Army outpost in Afghanistan of his own free will, but stopped short of finding he planned to permanently desert. He had left assigned areas before and returned. Bergdahl has said he was beaten, tortured and locked in a cage after trying to escape his Taliban captors.