Which of the following can be displayed on a security vehicle?

Displaying "Guard" on a security vehicle is appropriate and compliant with regulations regarding the identification of security personnel. Security vehicles need to communicate their purpose clearly without misleading the public. The term "Guard" is specific to the security industry and accurately represents personnel who are trained to protect property and individuals without law enforcement authority.

In contrast, terms like "Deputy," "Police," and "Patrolman" imply law enforcement authority and can create confusion among the public. Using these titles may misrepresent the capabilities and powers of security personnel, as they do not hold the same legal authority as state law enforcement officers. Therefore, utilizing "Guard" ensures transparency about the role of the security officer while maintaining compliance with legal standards for private security services.