A Counter Terrorist Specialist Firearms Officer (CTSFO) is a United Kingdom police firearms officer.^[1] The CTSFO standard is the highest Authorised Firearms Officer level in the National Police Firearms Training Curriculum (NPFTC) and was established by the Metropolitan Police Service in the lead up to the 2012 Summer Olympics held in London on 27th of July.^[2][3] The firearms units of police forces organise CTSFOs into teams to establish a police tactical unit.

A national capability to respond to terrorist incidents such as marauding terrorist attacks (MTA) through collaboration of police forces who maintain CTSFO teams was established known as the CTSFO Network.

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