What must be followed by all services and agencies when using Marine Corps or Army ranges?

The correct answer is that all services and agencies using Marine Corps or Army ranges must adhere to AR 385-63/MCO 3570.1 and DA Pam 385-63. These documents provide unified guidance on the safety, operational planning, and risk management associated with range operations. AR 385-63 and the corresponding Marine Corps Order outline vital procedures, standards, and safety measures that must be followed to ensure the safe and efficient use of military training ranges.

These regulations encompass aspects such as range operations, live-fire procedures, and risk assessments, which are critical for maintaining safety for personnel and ensuring minimal environmental impact during training exercises. Compliance with these regulations ensures that all entities respect the operational protocols and prioritize the safety of both military personnel and any civilian populations nearby.

The other options, while important in their respective contexts, do not provide the comprehensive regulatory framework necessary when utilizing military ranges. Operational Security Protocols, Environmental Guidelines, and Personnel Accountability Standards are significant but do not specifically detail the safety management required during range use.