AR 190-51 primarily addresses what aspect of Army operations?

The correct answer is that AR 190-51 primarily addresses the security of unclassified Army property. This regulation outlines the responsibilities and procedures associated with the safeguarding of Army property that is not classified, ensuring that such assets are protected against loss, theft, or misuse.

Understanding the focus of AR 190-51 is crucial for unit supply specialists, as it guides how they manage and secure the resources entrusted to them. The emphasis on security measures helps maintain operational readiness by ensuring that unclassified property is adequately protected.

The other options relate to other areas of Army operations. Personnel accountability focuses on tracking and ensuring the availability of soldiers, which is addressed in other regulations. Logistical equipment management pertains to the broader logistics framework and inventory practices that are not specific to AR 190-51. Army training and leadership development encompass a wide range of policies and regulations aimed at enhancing soldier skills and leadership abilities, which again falls outside the specific purview of AR 190-51. Each of these areas is important but distinct from the primary concern of security as outlined in AR 190-51.