What is the main purpose of the NCIC's 'Incident' database?

The main purpose of the NCIC's 'Incident' database is to document criminal incidents. This database serves as a crucial component of crime reporting and investigation, allowing law enforcement agencies to efficiently record and access information regarding various criminal activities. It enables officers to input details about incidents such as thefts, assaults, and other crimes, which can then be shared across jurisdictions. This functionality is vital for ensuring that law enforcement agencies have a comprehensive overview of crime patterns, trends, and ongoing investigations, thereby enhancing public safety and accountability within the system.

In contrast, the other options focus on areas outside the primary function of the 'Incident' database. For instance, maintaining a record of traffic regulations does not align with the emphasis on criminal incidents, while tracking training sessions for users and managing equipment inventories pertain to administrative functions that are separate from the incident reporting and documentation operations embedded within the NCIC database.