What is the function of a Personnel Number in the GCSS system?

The function of a Personnel Number in the GCSS system is to uniquely identify each individual within the system. This unique identifier is essential for various processes within the system, such as tracking workforce assignments, accessing personnel data, and ensuring the integrity of personnel records. By having a distinct number for each individual, the system can efficiently manage data without confusion or overlap, which is crucial for operations, accountability, and reporting within the military framework.

The other options, while they address important functions, do not represent the primary role of the Personnel Number. For instance, security clearance identification, performance reviews, and training records management are handled through different mechanisms and systems that complement personnel identification rather than serve as the core function of the Personnel Number itself.