Final answer:
A security guard can be referred to as a security officer; the terms are often used interchangeably, although 'security officer' may sometimes imply a higher rank or more responsibilities.
Step-by-step explanation:
True: A security guard can indeed also be referred to as a security officer. These terms are often used interchangeably within the security industry to reference a person employed to protect property, assets, or people. Although sometimes the title security officer may be used for someone with more responsibilities or a higher rank, in general practice, there is no strict distinction between a security guard and a security officer.