Executive Summary discussing the U.S. Southern Command's request to use additional interrogation techniques. On April 16, 2003, the Secretary of Defense, Donald Rumsfeld, approved the following techniques: change of scenery down, which was described as returning the detainee to a less desirable setting (e.g. Camp Delta to Camp X-Ray); dietary manipulation (giving detainees meals ready-to-eat (MREs); environmental manipulation (which is described as creating mild discomfort, such as temperature adjustment); sleep adjustment (which is described as reversing sleep cycles to keep the detainee off-balance, but it is not sleep deprivation); and false flag (which is described as role playing by interrogators, whereby they pretend to be citizens of another country). The following techniques required prior notice to the Secretary of Defense: isolation for periods of up to 30 days. ego down, removal of incentive and mutt and jeff.