What should a security officer do when first arriving at their shift?

When a security officer first arrives at their shift, conducting a site assessment and familiarizing themselves with any issues or changes is crucial. This practice ensures that the officer is aware of the current environment, potential security risks, and any specific incidents that may have occurred since the last shift. By assessing the site, the officer can identify changes in the facility, such as new security measures, maintenance issues, or unusual activities that could affect safety. This proactive approach equips the officer to effectively respond to situations and fulfill their responsibilities, thereby enhancing the overall security of the area they are tasked to protect.

The other options do not align with best practices for security readiness. Checking personal messages can distract from immediate responsibilities, waiting for instructions may lead to delays in critical decision-making, and starting the shift without preparation increases vulnerability to security breaches or incidents.