Final answer:
The Army Regulations that should be used during an investigation are the Manual for Courts-Martial (MCM) and Army Regulation (AR) 15-6. The MCM provides procedural rules for military trials, while AR 15-6 outlines procedures for Army investigations.
Step-by-step explanation:
The Army Regulations that should be used during an investigation are outlined in the Manual for Courts-Martial (MCM) and the Army Regulation (AR) 15-6. The MCM provides the procedural rules and regulations for the conduct of military trials, including investigations. It includes guidelines on evidence, witnesses, and the rights of the accused.
AR 15-6, on the other hand, specifically addresses the procedures and requirements for conducting investigations within the U.S. Army. It involves matters such as appointing investigating officers, conducting interviews, collecting evidence, and preparing investigation reports. These regulations ensure that investigations are conducted in a fair and thorough manner, preserving the rights of all parties involved.