They undergo two weeks of intensive training on the Glock 17 Pistol and the Heckler & Koch MP5 carbine; both weapons use 9mm rounds. This is followed by a further nine weeks of training focused on ARV tactics and searching buildings. Based at MPSTC, MO19 provides initial and continuation training for all MPS firearms officers. There are more than twenty courses provided by Nationally accredited firearms Instructors. Courses are based on the National Firearms Training Curriculum, to cover the variety of roles covered by AFOs in the MPS. The courses ranges from firepower demonstrations (to highlight the dangers of firearms to new MPS recruits) and initial firearms courses, to Operational Firearms Commander (OFC) training and National Firearms Instructor courses. There were 683 courses run at MPSTC in the 2006–07 financial year. Current organisation SCO19 currently has four tiers of armed officers. Armed Response Vehicles (ARV) The first tier is the Armed Response Vehicle, or ARV. Commonly referred to as the Trojans, ARVs are responsible for patrolling the city and to provide immediate armed support to other police units. ARVs will conduct targeted patrols of high crime areas, and are trained to engage in high speed pursuits. Each ARV is crewed by 3 Armed Response Officers: driver, communications operator and observer/navigator. Counter Terrorist Specialist Firearms Officers (CT-SFO) The highest tier is the Counter Terrorist Specialist Firearms Officer teams, deal with MPS operations and also national firearms operations as part of the CTSFO Network. They provide firearms support to borough and specialist units. They are multi-skilled and can deliver all elements of armed policing, including operations to combat major crime, hostage taking and terrorism. MO19 has seven CTSFO teams consisting of one sergeant and 15 constables, including females, with six CTSFO Inspectors and an Operational Senior Manager with a reported strength of 130 officers. An operational CTSFO team works a 7-week shift-pattern which includes night duty. CTSFO teams are able to be deployed by air or the river, using armoured vehicles and motorcycles if needed. On 28 July 2014, the single Armed Response Vehicle service was launched. In preparation for the Summer Olympics held in London in July 2012, officers were up-skilled from SFO standard, to a new certification known as Counter Terrorist Specialist Firearms Officer (CTSFO). This included the use of live rounds during close quarters combat (CQC) training and fast-roping from helicopters, to be able to respond more effectively to