[52] Section 46 of the Policing and Crime Act 2017 has in effect abolished police traffic wardens allowing police to focus on their core duties. Acting inspectors were denoted by a crown in the place of their divisional letters, whilst keeping their collar number and chevrons. Special constabulary epaulettes frequently bear the letters "SC" (with or without a crown above) to differentiate them from regular officers. The "detective" prefix designates that the officer has received suitable training and passed related examinations to conduct criminal investigations.[50]. A few other forces still use divisional codes. However, since 2000, the National Policing Improvement Agency has encouraged special constabularies to return to rank structures and epaulette insignia identical to their regular counterparts. Hampshire Constabulary Volunteer Police Cadet programme is divided into units consisting of around thirty cadets with a head cadet, deputy head cadet and team leaders. In the UK, ranks tend to be fairly standardized from jurisdiction to jurisdiction, with some minor differences. The Isle of Man police ranks follow the structure of other British police rank structures however it is notably missing the Chief Superintendent and Assistant Chief Constable ranks within their own structure. The above ranks are used by all territorial forces in the United Kingdom, and the specialist national forces: the British Transport Police, Ministry of Defence Police, and Civil Nuclear Constabulary. 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. Assistant chief constables and deputy chief constables wear two rows of oak leaves. The rank of an officer can be found in varying details of the uniform such as headgear, sleeve patches and tunic collar details. South Yorkshire Police and Kent Police have PCSO supervisors. Would you like Wikipedia to always look as professional and up-to-date? Special constabulary epaulettes frequently bear the letters "SC" (with or without a crown above) to differentiate them from regular officers. Constables who are training to become detective constables sometimes bear the title trainee investigator (T/I) or trainee detective constable (T/DC). Police officers do not need to be on duty to exercise their powers and can act off duty if circumstances require it (technically placing themselves back on duty). For example, rank insignia and collar numbers on epaulettes are gold, as are the bands and oak leaves on the caps of senior officers, and officers of or above the rank of commander wear gold-on-black gorget patches on the collars of their tunics.