Which of the following best describes a key function of the Class V supply office?

The key function of the Class V supply office is to centralize the management of ammunition and explosives. This role is crucial because it ensures that all activities related to the acquisition, storage, distribution, and accountability of ammunition and explosives are efficiently coordinated. By centralizing these functions, the supply office can maintain better oversight and control, which enhances safety, readiness, and compliance with regulations surrounding the handling of dangerous materials. This centralized approach allows for streamlined operations and enables responsiveness to the needs of units requiring these supplies, contributing significantly to operational effectiveness.

The other options, while they may involve aspects of supply chain management, do not accurately capture the primary role of the Class V supply office. Forecasting supply market changes pertains more to market analysis rather than direct supply management. Coordinating direct deliveries from manufacturers is a logistical role but not specific to Class V supply, which focuses on ammunition. Lastly, distributing supplies only during wartime overlooks the continuous need for ammunition and explosives in peacetime preparations and training.