( CNN ) -- A two-star U.S. Army general will begin investigating this week how and why Army Sgt . Bowe Bergdahl left his base in Afghanistan , resulting in his capture , a senior defense official said . Bergdahl spent five years in captivity until his release May 31 , in exchange for five Taliban figures being held at a U.S. military detention facility in Guantanamo Bay , Cuba . Bergdahl , 28 , returned to the United States -- specifically to an Army medical facility in San Antonio , Texas -- early Friday . Though the investigation begins this week , it 's not known when the sergeant will undergo formal questioning . The senior defense official declined to name the general who will investigate until there is a formal announcement . Bergdahl went missing on June 30 , 2009 , in Afghanistan 's Paktika province , where he was deployed with the 1st Battalion , 501st Infantry Regiment , 4th Brigade Combat Team , 25th Infantry Division . An Army fact-finding investigation conducted in the months after his disappearance concluded he left his outpost deliberately and of his own free will , according to an official who was briefed on the report . The Army has no definitive finding that Bergdahl deserted because that would require knowing his intent -- something officials could n't learn without talking to the soldier , a U.S. military official recently told CNN . Bergdahl arrived in San Antonio from a military hospital in Landstuhl , Germany , where he 'd been recuperating since his release May 31 in exchange for five Taliban figures held at Guantanamo Bay , Cuba . Officials have described Bergdahl 's condition as stable . With Qatar as the broker , the United States struck a deal with the Taliban to free Bergdahl . The Obama administration did n't tell Congress of the releases . Under law , the White House has to give a 30-day notice to Capitol Hill before any terrorists are transferred from Guantanamo . Believing that his health was deteriorating , the administration said it acted quickly to save his life . U.S. special operations forces recovered Bergdahl without incident on May 31 at a helicopter pickup point in eastern Afghanistan , near the border with Pakistan .
Source : A two - star general has been appointed to investigate Bowe Bergdahl 's disappearance . The general is expected to begin work on the investigation this afternoon , the source said . The source failed to identify the caller .