"Once, somebody brought it up with the colonel. 'Will [the Red Cross] ever be allowed in here?' And he said absolutely not. He had this directly from General McChrystal and the 
Pentagon that there's no way that the Red Cross could get in: "they won't have access and they never will. This facility was completely closed off to anybody investigating, even Army investigators." ...
During his first six or seven weeks at the camp, Jeff conducted or participated in about fifteen harsh interrogations, most involving the use of ice water to induce hypothermia ...
Cold can be a serious torment to a naked man on a winter night; in Afghanistan, one prisoner died from hypothermia. Sometimes, to maximize the humiliation of the Iraqi men, American women would be brought in to watch them undress. Sleep deprivation was also used to an extreme extent, especially in Jeff's early days at Nama.
They could keep a prisoner on his feet for twenty hours, and although the rules required them to allow each prisoner four hours of sleep every twenty-four hours, nowhere did it say those four hours had to be consecutive--so sometimes they'd wake the prisoners up every half hour. Eventually they'd just collapse. "This was a very demanding method for the interrogators as well, because it required a lot of staff to monitor the prisoner, and we'd have to stay awake, too," Jeff says. "And it's just impossible to interrogate someone when he's in that state, collapsed on the ground. It doesn't make any sense."
Within the unit, the interrogators got the feeling they were reporting to the highest levels. The colonel would tell an interrogator that his report "is on Rumsfeld's desk this morning" or that it was "read by SecDef." "That's a big morale booster after a fourteen-hour day," Jeff says with a tinge of irony. "Hey, we got to the White House."