Bowe Bergdahl, the American sergeant held prisoner in Afghanistan, was locked in solitary confinement for two straight years and did not see another human face for that entire time, report senior military sources.

Bergdahl was captured in Afghanistan in June 2009 and released on May 31 in a deal struck by the Obama administration in which 5 Taliban officials were released from detention.

Bergdahl could only converse to his captors through the wall of a six-foot-by-six-foot metal box, in which he was kept. The box was just big enough for him to stand up straight and stretch his arms. He was hooded whenever he was taken out of the box. Reports indicate that this treatment began after Bergdahl made an escape attempt, the details of which have not been made public.

Bergdahl arrived at Brooke Army Medical Center in San Antonio on a flight from Ramstein Air Base. The 28-year-old Idaho native was expected to be reunited there with his family.

Officials told a Friday afternoon press conference that there is no timeline for Bergdahl’s reintegration. They said Bergdahl was a normal person who went through an abnormal event and said that part of his rehabilitation process was readjusting to normal life.

Bergdahl’s family has asked for continued privacy in a statement released Friday on their behalf by military officials.

Officials have not disclosed the details of Bergdahl’s condition out of concern that he should not be rushed back into the public spotlight.

No media were allowed to witness the former prisoner’s return.

He and two other American civilians were brought to BAMC after being held captive for five years by Colombian rebels after their plane crashed while working on a U.S. drug interdiction mission.

However, the Taliban has alleged that it did not kidnap him; rather they found him wandering aimlessly along a road.

The Pentagon has promised that they will be exhaustive in discovering why he was held for the best part of five years by the Taliban and the Obama administration has defended the decision to free him.

Bergdahl was released from Taliban captivity on May 31 and has been at Landstuhl Regional Medical Center in Germany since June 1. He was deployed in eastern Afghanistan when he disappeared in June 2009.

Many have criticized the Obama administration for agreeing to release five Taliban prisoners from detention at Guantanamo Bay, Cuba, in exchange for Bergdahl.