Late in the afternoon of Saturday, May 31, Barack Obama strode confidently to a lectern in the White House Rose Garden flanked by the parents of Sergeant Bowe Bergdahl, a soldier who had gone missing from his platoon in the mountains of Afghanistan in June 2009. “This morning I called Bob and Jani Bergdahl and told them that after nearly five years in captivity, their son, Bowe, is coming home,” Obama said. The president thanked service members who “recovered Sergeant Bergdahl and brought him safely out of harm’s way.” Obama also expressed gratitude to the diplomats who had handled the...