All officers have a unique identification number. These are usually referred to as shoulder or collar numbers, referring to the fact that they were once worn on the uniform collar and later on the epaulettes by constables and sergeants. Uniformed officers in many forces still wear them on the epaulettes, but other forces have badges or other ways of displaying their identification numbers. Kent Police, for instance, refers to its numbers as force numbers and officers wear them on a velcro tab on their stab vest or on a badge attached to their shirt or tunic. Officers in all forces of the rank of inspector or above do not usually wear their numbers.