As a child studying in a madrassa in Afghanistan, Mohammad Khalid Tahir dreamed of waging jihad. By the time he was a teenager, he had joined the Taliban and celebrated when they seized power from the U.S.-backed government two years ago.
But the high from that victory did not last. Reassigned as a soldier in Kabul, Afghanistan’s capital, he frequently complained that he was bored and longed to return to his life’s purpose, according to his family.