What is the term for a security officer who carries or has immediate access to a firearm while performing their duties?

The term for a security officer who carries or has immediate access to a firearm while performing their duties is an "Armed Security Officer." This designation indicates that the individual has undergone specific training and has met legal requirements to carry a firearm in the course of their security tasks. Armed security officers typically have responsibilities that may involve protecting people, property, and assets in potentially dangerous situations where a firearm may be necessary for their safety and that of others.

In contrast, an unarmed security officer does not carry a weapon and relies on other means of protection and conflict resolution. A security guard is a more general term and does not specify whether the individual is armed or unarmed. An executive protection agent often refers to someone responsible for the safety of a specific individual or group, typically in high-risk situations, and may also be armed, but this title implies a more specialized role compared to the more general designation of an armed security officer.