The Army's statement:

The Army has initiated its investigation into the facts and circumstances surrounding the disappearance and capture of Sgt. Bowe R. Bergdahl from Combat Outpost Mest-Lalak in Paktika Province, Afghanistan on or about June 30, 2009. The Army has appointed as the investigating officer Maj. Gen. Kenneth R. Dahl, an Army officer with Afghanistan combat experience.
The primary function of this investigation, as in any other investigation, is to ascertain facts and report them to the appointing authority. These types of investigations are not uncommon and serve to establish the facts on the ground following an incident. The investigating officer will have access to previously gathered documentary evidence, including the 2009 investigation.

The Army's top priority remains Sgt. Bergdahl's health and reintegration. We ask that everyone respect the time and privacy necessary to accomplish the objectives of the last phase of reintegration. The investigating officer will not interview Sgt. Bergdahl until the reintegration team clears such interaction, so no timeline for completion of the investigation has been set.

http://talkingpointsmemo.com/livewire/army-investigation-bergdahl-disappearance