Most of the security forces are U.S. Army military police, and U.S. Navy Masters-at-Arms. The camps have different amenities and levels of comfort. Detainees are quartered in different parts of Camp Delta according to their level of cooperation with guards and interrogators, with the exception of newly arriving detainees who always go to maximum security in Camp 3. Thereafter, cooperative detainees are moved to Camp 2 and then Camp 1 as rewards for cooperation. When detainees cooperate and are thought to show no security risk they can be moved to the buildings of Camp 4, which have a shower and lavatory, plus four communal living rooms for 10 detainees each. In Camp 4, each detainnee has a bed and a locker. Camp 4 detainees may eat their meals together, instead of alone in their own cells