A defector like Lee Harvey Oswald?
At least Oswald waited for his military discharge to defect to the other side.
But just like Bergdahl (and his father) Oswald was a long time enemy sympathizer and while a Marine made a point to learn and speak Russian - earning the nickname "Oswaldskovich."
IMO Obama's "trade" not only freed 5 foreign terrorists but brought back to America a domestic enemy time-bomb.