1992 09 28 Field Manual 34-52: This is the Army Field Manual that gave US doctrine (how to conduct interrogation operations) from 1992 until it was superseded by the new Field Manual in 2006.
1997 10 01 AR 190-8 Enemy Prisons of War: This is the Army Regulation (which applied to all of DoD) on how to treat Prisoners of War, Retained Persons, Civilian Internees, and any other detainees under US military control. It was recently updated, in 2015, but was the official regulation from 1997 until 2015.
2004 06 Jacoby Report: A review of interrogation and detention operations in Afghanistan.
2004 07 21 Detainee Operations Inspection Report: This was a detailed inspection of DoD detainee and interrogation operations. It included a psychologist on the team of investigators.
2005 04 01 AR 15-6 Investigation into FBI Allegations at GTMO: This was a formal investigations into abuse at GTMO based on allegations from the FBI.