The SO19, Central Operations Specialist Firearms Command, (now known as CO19) is a special police force based in the United Kingdom. They are basically police officer's equipped with body armour and machine guns who are called during an emergency situation, usually involving suspects who are armed. In America, SO19 is the equivalent of S.W.A.T.
Frank Carter works for them by responding to their emergency calls in the missions: Disturbance in Soho and Painting the Town Red. They also assist Frank in the missions: The Bargain Basement and Show some Remorse. Despite this, they seem to dislike Frank and tell him to get out of the way and leave it to the experts. Frank laughs at them saying if he left it to the 'experts' then they would all be dead. They also attempt to kill Mark Hammond when he attacks Snow Hill during the mission: Filthy Business, when he kills Clive McCormack. Other than the missions listed, they do not appear any other time.
- Ben Mitchell - The newly transferred and aggressive sergeant.
- Paul Evans - An armed member of the squad.
- Jack Harvey - An armed member of the squad.
- Stoppard - An armed member of the squad.
- Finch - The surveillance specialist.
After Munroe is killed, it is likely that Mitch would have taken over the unit if he survives the outcome of the game. If Mitch dies, then Evans would have most likely become the new head of the unit.