What document outlines the rights of military personnel under Article 31(b)?

The correct choice is the Uniform Code of Military Justice (UCMJ) because Article 31(b) specifically pertains to the rights of military personnel regarding self-incrimination and the right to remain silent when subject to questioning. The UCMJ serves as the foundational legal framework for the military justice system, detailing the legal rights and obligations of service members.

Article 31(b) establishes that military personnel cannot be compelled to incriminate themselves, which is a crucial protection in the context of military law. This article ensures that individuals are aware of their rights before undergoing any interrogation, similar to the rights guaranteed in civilian law but specifically tailored for military operations and circumstances.

The U.S. Constitution provides broader legal rights, but it is the UCMJ that specifically enshrines the procedural rights for military members. Similarly, while the Bill of Rights outlines many civil liberties, it is not the document that directly addresses military personnel's rights in a military context. Federal Regulations may address various administrative and procedural matters but do not specifically articulate the rights under military law like the UCMJ does.