Army specialist Terry Holdbrooks had been a guard at Guantánamo for about six months the night he had his life-altering conversation with detainee 590, a Moroccan also known as "the General." This was early 2004, about halfway through Holdbrooks's stint at Guantánamo with the 463rd Military Police Company. Until then, he'd spent most of his day shifts just doing his duty. He'd escort prisoners to interrogations or walk up and down the cellblock making sure they weren't passing notes. But the midnight shifts were slow. "The only thing you really had to do was mop the center floor," he says....