Which function relates to the planning and availability of materials in GCSS-Army?

The function that relates to the planning and availability of materials in GCSS-Army is Material Requirements Planning. This function is essential as it focuses on ensuring that the necessary materials and resources are available when needed for operations, thereby enabling effective and efficient supply chain management within the Army. It involves analyzing the demand for materials and forecasting the necessary quantities to meet that demand, taking into account the lead times for replenishment and the inventory levels.

This proactive planning helps in minimizing shortages and optimizing inventory levels, which allows for streamlined operations and support for various missions. By using Material Requirements Planning, the Army can align its logistics with operational requirements, ensuring that units have the right materials at the right time.