What document provides the regulations on legal assistance, non-judicial punishment, claims, and administrative investigations?

The correct document that addresses regulations on legal assistance, non-judicial punishment, claims, and administrative investigations is the JAGMAN, which stands for the Judge Advocate General's Manual. This manual serves as a comprehensive guide for legal officers in the military and outlines the procedures and policies regarding various legal matters within the armed forces.

JAGMAN provides the specific regulations that military personnel need to follow when dealing with legal assistance issues, outlines procedures for non-judicial punishment, details how claims can be filed and processed, and explains how administrative investigations should be conducted. Its primary purpose is to ensure that military members have clear and accessible guidelines for navigating these important aspects of military law and administrative processes.

In contrast, the Uniform Code of Military Justice sets forth the foundational legal framework for military justice but does not provide detailed procedural guidance on the aspects mentioned. The Manual for Courts-Martial is focused specifically on the processes and rules governing courts-martial, while the Military Justice Act pertains to legislative changes and updates to military justice but does not serve as a manual for everyday legal processes and procedures.