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FILE - This undated file image provided by the U.S. Army shows Sgt. Bowe Bergdahl. A Pentagon investigation concluded in 2010 that Bergdahl walked away from his unit, and after an initial flurry of searching, the military decided not to exert extraordinary efforts to rescue him, according to a former senior defense official who was involved in the matter. Instead, the U.S. government pursued negotiations to get him back over the following five years of his captivity — a track that led to his release over the weekend. (AP Photo/U.S. Army, File)
FILE - This undated file image provided by the U.S. Army shows Sgt. Bowe Bergdahl. A Pentagon investigation concluded in 2010 that Bergdahl walked away from his unit, and after an initial flurry of searching, the military decided not to exert extraordinary efforts to rescue him, according to a former senior defense official who was involved in the matter. Instead, the U.S. government pursued negotiations to get him back over the following five years of his captivity — a track that led to his release over the weekend. (AP Photo/U.S. Army, File)

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    Do letters reveal why Bergdahl vanished?

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Do letters reveal why Bergdahl vanished?

Letters written by U.S. Army Sergeant Bowe Bergdahl while in Taliban captivity may explain why he disappeared.

Do letters reveal why Bergdahl vanished?

Letters written by U.S. Army Sergeant Bowe Bergdahl while in Taliban captivity may explain why he disappeared.