How is a National Stock Number (NSN) composed?

A National Stock Number (NSN) is composed of a 13-digit number that combines both a classification code and an item identification number. The NSN system is designed to uniquely identify items of supply in the U.S. Department of Defense logistics system.

The first set of digits represents the Federal Supply Classification (FSC) which categorizes the item, while the latter set provides a unique item identifier. This structure allows for efficient inventory management and procurement processes, ensuring that every item within the military supply chain is easily identifiable and traceable.

The other options reflect incorrect formats or components of the NSN. For example, there is no 10-digit, 15-digit, or 12-digit compositions that adhere to the NSN standards, nor are they solely based on item type. Understanding the NSN's structure is crucial for personnel working in logistics, inventory, and supply chain management within military operations.