after five years in taliban captivity u.s. army sergeant bowe bergdahl is back on american soil. touching down overnight bergdahl arrived at lackland air force base in san antonio and transported to a military medical facility with a room prepped for his arrival and a support team standing by along with his family. >> he just came out of five years of canptivity. we're going to get a chance to find out what was in his head there that day when he was taken captive. >> reporter: "the daily beast" with letters. they may give a glimpse into his disappearance in 2009, writing, leadership was lacking, if not nonexistent. the conditions were bad and looked to be getting worse for the man that were actually the ones risking their lives from attack. the letters are dated 2012 and 2013. penned in two very different writing styles. one in cursive. the other in block print.