Which of the following is part of the logistics functions?

The logistics functions within the context of the USMC primarily focus on the efficient movement, supply, and management of resources necessary to support operations. Maintenance is a critical component of logistics as it ensures that equipment and vehicles are operational and ready for use. This involves regular checks, repairs, and the overall upkeep of military assets to enhance their reliability and performance in the field.

While distribution planning, security operations, and personnel training play significant roles in support and operational effectiveness, maintenance explicitly falls under the logistics purview due to its direct influence on the sustainment aspects of military readiness and capability. Proper maintenance ensures that logistical operations continue smoothly, reinforcing the importance of this function within the broader logistics framework.