Which manual outlines the Army's Uniform Code of Military Justice (UCMJ)?

The Manual for Courts-Martial (MCM) is the correct choice because it serves as the official document that outlines the procedures and rules for trying military personnel under the Uniform Code of Military Justice (UCMJ). The MCM contains the UCMJ itself, as well as rules for courts-martial, which are essential for ensuring that due process is observed in military legal proceedings. It explains the different types of offenses defined by the UCMJ and describes the various types of courts-martial and their operations.

Understanding the MCM is crucial for personnel involved in military justice, as it ensures that service members are held accountable in a fair and legally defined manner. The other options refer to different aspects of military regulation and policy but do not specifically deal with the UCMJ or the process of military justice in the context of courts-martial.