Bergdahl arraignment Bergdahl was charged with desertion, a difficult-to-prove accusation that requires military prosecutors to prove that he left his base without intending to return. But he's also accused of "misbehavior before the enemy," a rarely-invoked charge in which prosecutors only have to prove that Bergdahl "endanger[ed] fellow soldiers when he 'left without authority; and wrongfully caused search and recovery operations,'"according to Military Times

The charge of misbehavior before the enemy was used hundreds of times during World War II, but scholars say its use appears to have dwindled in conflicts since then. Legal databases and media accounts turn up only a few misbehavior cases since 2001, when fighting began in Afghanistan, followed by Iraq less than two years later. In contrast, statistics show the U.S. Army prosecuted about 1,900 desertion cases between 2001 and the end of 2014.

Bergdahl's case has drawn renewed attention as the topic of season 2 of the popular podcast "Serial," which premiered on December 10th and includes Begdahl's only post-captivity media interview.  In the premiere episode, Bergdahl claimed that he intended to trigger a wide-scale manhunt in leaving his base, but then changed his mind and decided to walk to a forward operating base some 20 miles away from his outpost.