Joshua Casteel served as an Army interrogator at Abu Ghraib. He used fear, manipulation and false promises to get intelligence from Iraqis, most of whom, he believed, had nothing to do with the insurgency. Even when he interrogated a young Saudi who admitted to being a fighter, Joshua was filled with doubts. He actually identified with the young Saudi, and shortly after that, informed his superiors that he would apply to become a conscientious objector.Also in this epsiode: Dean Williams served in the Peace Corps in Guatemala over 20 years ago, introducing fish farming to villagers in a small mountain village. Dean left the country thinking that the project had failed. But on a recent trip back to the area, he got a big surprise.