High Quality Content by WIKIPEDIA articles! Central Operations Specialist Firearms Command (CO19) (previously known as SO19) is a Central Operations branch within Greater London's Metropolitan Police Service. The Command is responsible for providing a firearms-response capability, assisting the rest of the service which is routinely unarmed. Within the media it is occasionally compared to the SWAT units of the United States, being seen as London's equivalent.On occasion, they have been referred to as the "blue berets", as they used to wear these, today they are more likely to wear combat helmets (of PASGT type).