I wanted to weigh in on this immediately, because of my very strong feelings as a former Army officer myself. I felt it best to wait, and let the anger subside.
It still has not.
There are three questions and no real good answers.
The truth, then, paraphrasing how Sherlock Holmes would argue, when all other explanations are ruled out, must be the one left, no matter how improbable.
So here we go:
The Sgt. Bergdahl story is front page news, all over the internet, too. These links will get you a flavor of the story.