The report Nuremberg betrayed: Human experimentation and the CIA torture program by the Physicians for Human Rights (PHR) describes the enhanced interrogation conducted by the Central Investigation Agency (CIA) of the United States of America on detainees, following the 9/11 attacks. The CIA's programme of "enhanced interrogation" was derived from the US Military's programme "Survival, Evasion, Resistance and Escape" (SERE) which is taught to military personnel to be able to resist interrogation and torture if they became detainees, and to increase their resilience. The techniques included milder forms of torture on subjects who were "volunteers" from the US military, who could stop the torture any time they wished. The risk of harm was significant; but precautions were in place.