Bergdahl walked away from the Army OP in civilian clothes leaving his weapon and gear behind and joined up with the Taliban/enemy. Clearly he deserted his post and collaborated with the enemy. The definition of Traitor. He should be charged with UCMJ Articles 84, 85, 86, 105 and any others that apply. Then perp walked into a Court Martial, not given a welcome home parade.
Found an article this weekend that said he had mailed his uniform and some books home already, as well, prior to being captured.