Mohamedou Salahi spent more than fourteen years in detention at Guantánamo Bay, where he was repeatedly tortured. Mohamedou Salahi spent more than fourteen years in detention at Guantánamo Bay, where he was repeatedly tortured. In 2004, Steve Wood was deployed to Guantánamo Bay, as a member of the Oregon National Guard. He and his comrades were told that many of the detainees were responsible for 9/11 and, given the opportunity, would strike again. “I just remember being super excited, because I thought, I’m going to be doing something important,” Wood told me. For two weeks, he worked as a guard in the cellblocks, monitoring men who had been captured on the battlefields of Afghanistan. Then a sergeant major pulled him aside for a brief interview, and assigned him to work the night shift in Echo Special, a secret, single-occupancy unit that had been built to house the United States military’s highest-value detainee. The International Committee of the Red Cross—which has access to many of the world’s most notorious detention sites, some of them in countries where there is no rule of law—had recently sent representatives to Guantánamo, but the base commander, citing “military nece...