Controlled inventory item codes are used to:

Controlled inventory item codes are primarily used to identify the degree of security required for munitions items while they are in storage or transit. This system is essential in ensuring that sensitive and potentially dangerous items receive the appropriate level of security based on their classification and inherent risk factors. By categorizing items through these codes, inventory managers can implement the necessary security measures and protocols, thereby ensuring compliance with safety regulations and enhancing safety and accountability within munitions operations.

The other choices, while they may relate to inventory management in various capacities, do not specifically pertain to the primary use of controlled inventory item codes. For example, tracking shipment delivery times and determining item popularity are more related to logistics and market analysis, respectively. Additionally, calculating inventory purchase costs is a financial aspect of inventory management that does not derive from security codes. Overall, the focus of controlled inventory item codes is distinctly on security management.