Mississippi Security Guard Board Practice Exam

The term "back in service" is used in law enforcement and security fields to denote when an officer or security guard is available again for new assignments or calls. This can be after completing an assignment, returning from break, or after performing administrative tasks. The 10 Code system is a standardized set of numerical codes used for communication. In this system, the code 10-8 denotes "in-service" or "back in service." Therefore, when a security guard is back in service in Ontario, they would use the code 10-8. This is why the correct answer is 10-8.