Bergdahl was questioned at Fort Sam Houston in Texas where he has been staying since returning to the US, said his attorney, Eugene R Fidell yesterday.
"Sgt Bergdahl answered all questions put to him. The interview is proceeding. It has been a productive expenditure of time," Fidell said in a telephone interview during a break in the questioning. Fidell declined to comment on what specific questions Bergdahl was asked.
Article 31 pertains to individuals being informed of the nature of the accusation against them and says that they do not have to make any statement to investigators.
"This in an ongoing investigation; the investigating officer has 60 days from his appointment to conclude his investigation; however, he can request additional time if he feels it is necessary," Conway said in an emailed statement. She did not respond to an inquiry about what type of questions investigators asked.
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A well-known lawyer and military justice expert who is currently a visiting lecturer at Yale Law School, Fidell described the setting of Bergdahl's interview as "a comfortable environment," a room with a sofa and a couple of chairs.
He said there were four people in the room, the interview was being recorded and that they were taking breaks throughout the day.
It was not immediately known how long the interview would last. But Fidell said he expected this would be the only interview Bergdahl would be giving as part of the investigation.
The Idaho native was freed by the Taliban May 31 in a deal struck by the Obama administration in which five senior Taliban officials were released from detention at Guantanamo Bay, Cuba.