Final answer:
AR 710-2 is the regulation that covers the national supply policy, which is not listed among the options provided in the student's question. The other AR options relate to various other aspects of Army regulations but not supply policy.
Step-by-step explanation:
The AR that covers the national supply policy is AR 710-2. This regulation is not listed among the options provided in the question. The options mentioned relate to different areas: AR 25-50 pertains to preparing and managing correspondence, AR 385-10 involves the Army Safety Program, AR 600-9 relates to the Army Body Composition Program, and AR 350-1 covers Army Training and Leader Development.
AR 710-2 establishes policies for inventory management and the supply chain within the Army. It outlines procedures for demanding and receiving supplies, maintaining equipment, and handling inventory. Understanding these regulations is crucial for efficient logistical operations and maintaining readiness within the military. It outlines the policies and procedures for inventory control, requisitioning, storage, and distribution of supplies at the unit and organizational level.