Which supplements add additional requirements to Army Regulations?

Selecting Army National Guard supplements as the correct answer highlights their role in establishing additional requirements that complement existing Army Regulations. These supplements are tailored specifically to address the unique operational needs, challenges, and procedures that are pertinent to the Army National Guard structure and its mission.

By doing so, they ensure that the guidance provided in Army Regulations is effectively adapted and enhanced to fit the context of the National Guard, which often operates in a dual state-federal capacity. This specificity is essential as it allows for the intricacies of National Guard operations—such as different readiness levels, training schedules, and mobilization processes—to be adequately addressed.

Other types of supplements mentioned might enhance or clarify existing regulations but do not specifically add additional requirements at the same level or for the same audience that Army National Guard supplements do. Field Training Supplements typically focus on operational execution rather than regulatory adaptations. National Command Supplements are more likely to address higher-level strategic provisions, and Logistics Supplements generally deal with supply chain and logistical operations more than fundamental regulatory frameworks. Thus, only Army National Guard supplements inherently provide the needed adjustments to Army Regulations to fit their particular context.