with the specialist aspects of crime investigation, tending to focus on serious crime, but not exclusively and provides support to territorial divisions' efforts in investigating crime. Crime Division has a command team structure of a divisional commander, supported by a director of intelligence, lead senior investigating officer, support manager and divisional administrative manager, based at the Chelmsford headquarters. This team is supported by section heads. The work of the various departments of Crime Division are both proactive and reactive. Major Investigation Team The way in which major crimes are investigated has changed over time. 30 years ago, the head of Crime Division would have carried out every part of the investigation in a murder case himself, including interviewing key witnesses. However, this has now been transformed with the advent of computerised Major Investigation Rooms and concerns over handling complex, high-profile enquiries like the Stephen Lawrence case. In April 2000, the Major Investigation Team (MIT) was set up to investigate homicides, abductions, rapes and extortion. Each major investigation has a senior investigation officer (SIO), who is like the conductor of an orchestra, overseeing all the different parts of the investigations. The SIO works with a MIT and they are supported by the resources of Major Investigation Centralised Administrative Support (MICAS). There are four MIT offices, at Harlow, Brentwood, Stanway and Rayleigh. The scale of enquiry determines the manpower required, the well-publicised case of the murdered schoolgirl Danielle Jones in June 2001 being a good example of the four offices 'pooling' resources and working as one team. Operational Support Group (OSG) The OSG are members of Essex Police trained to deal with riots, drugs raids, other public order incidents, escorting suspects to be extradited to other countries, CRBN, and evacuation in the event of CRBN attack. They are the equivalent of the Met's TSG unit. They were involved in President Obama's landing at Stansted in 2016. They helped the Met deal with the 2011 London Riots. They are based at Boreham, outside of Chelmsford. When not engaged in other specialists duties, OSG officers perform mobile patrols. Most officers are trained in advanced driving, and assist Roads Policing Unit colleagues in pursuits and policing the roads using high performance vehicles. Alternatively, officers may support local officers in policing the night-time economy. Force Support Unit (FSU) The FSU provide firearms and tactical assistance, equivalent to the Met's CO19 branch. They respond to firearms callouts,