middle replacing the insignia from the Order of the Bath. The crest of the force was modified in 1997. The rank structure, organisation and insignia are similar to those used by the Metropolitan Police Service until the mid-1970s. Gazetted Commissioner of Police (CP) (Traditional Chinese: ): crest over pip over wreathed and crossed batons. Deputy Commissioner of Police (DCP) (Traditional Chinese: ): crest over wreathed and crossed batons. Senior Assistant Commissioner of Police (SACP) (Traditional Chinese: ): pip over wreathed and crossed batons. Assistant Commissioner of Police (ACP) (Traditional Chinese: ): wreathed and crossed batons. Chief Superintendent of Police (CSP) (Traditional Chinese: ): crest over two pips. Senior Superintendent of Police (SSP) (Traditional Chinese: ): crest over pip. Superintendent of Police (SP) (Traditional Chinese: ): crest. Inspectorate Chief Inspector of Police (CIP) (Traditional Chinese: ): three pips. Senior Inspector of Police (SIP) (Traditional Chinese: ): two pips over bar. Inspector of Police (IP) (Traditional Chinese: ): two pips. Probationary Inspector of Police (PI) (Traditional Chinese: ): pip. Junior Police Officer (Rank and File) Station Sergeant (SSGT) (Traditional Chinese: ): wreathed crest. Sergeant (SGT) (Traditional Chinese: ): three downward-pointing chevrons. Senior Constable (SPC) (Traditional Chinese: ): downward-pointing chevron. Police Constable (PC) (Traditional Chinese: ): slide with ID number. Up until 1997, uniforms and hats had distinctions according to their rank. For example, senior constable and sergeant ranks are plastic ranks on the sleeve of the uniform. Special Duties Unit, Marine Police, and the Counter-terrorism Response Unit have their ranks at the back of the helmet or vest. Inspector to senior superintendent ranks have an insignia on the collar of the uniform. Chief Inspectors have a wide black stripe fitted on their police hats. Superintendents also have a small white stripe fitted on the police hat. Senior Superintendents and Chief Superintendents have a wide white stripe on their hats, Assistant and Senior Assistant Commissioners have 1 row of silver oak leaves on the edge of their hats while Deputy Commissioner and Commissioner has 2 rows of silver oak leaves, a slide with a silver vertical line on the collar of the uniform, a black baton, and a red whistle or a black and white whistle on the front right pocket. Uniforms and equipment Current uniform The current Hong Kong Police uniform was implemented in 2005. Most front-line officers wear a light blue shirt and dark blue cargo trousers, while senior officers wear