Quoted:
They speak Pashto which is an Afghani language. Source:
http://nypost.com/2014/05/31/the-bizarre-tale-of-americas-last-known-pow/
Some other interesting tidbits from that article:
As a teen, the home-schooled son of Calvinists took up ballet — recruited to be a "lifter” by "a beautiful local girl,” Rolling Stone reported, "the guy who holds the girl aloft in a ballet sequence.” The strategy worked: Bergdahl — who also began dabbling in Buddhism and tarot card reading — soon moved in with the woman.
Even as a teen, he could fire a .22-caliber rifle with precision.
At age 20, he traveled to Paris and started learning French in hopes of joining the French Foreign Legion.
His application was rejected, and he was devastated, the magazine reported.
Bergdahl would drift for years, working mainly at a coffee shop near home.
He briefly considered moving to Uganda to help villagers being terrorized by militias before deciding on a different adventure.
"I’m thinking of joining the Army,” he told his folks after already having signed up.
Bergdahl’s dream was to help Afghan villagers rebuild their lives and learn to defend themselves, his dad told the magazine.