Airwave emergency service secure radio system, which is due to be replaced in the early 2020s. Operations department The operations department provides uniformed operational support to the force, and is responsible for traffic policing and tactical support. Roads policing Unit Devon and Cornwall Police patrol a section of the M5, as well as many 'A' roads. The unit is split up into seven road policing sectors. The unit also has officers that patrol on motorcycles. Force Support Group The Force Support Group (FSG), previously called the Tactical Aid Group (TAG), is predominantly responsible for public order, marine operations, searches and dealing with potentially violent offenders. The FSG's Marine Support Unit, also known as FSG D Section, is responsible for underwater search and marine operations. Dog section The force has police dogs, which are trained in a variety of roles including drugs dogs, explosives dogs and firearms support dogs. The unit, which is headed up by an inspector, is based at headquarters in Middlemoor, in Exeter. Armed Response Also under Devon and Cornwall’s Operations Department is the Firearms Unit. All officers are trained as Armed Response Vehicle Officers (ARVOs), with the additional Tactical Firearms Team (TFT) who are SFO’s. The ARVs are tasked with responding to incidents where firearms and other weapons are involved. They are routinely armed. Air Operations Unit Air support is provided by the National Police Air Service (NPAS), which operates a dedicated police helicopter out of Exeter Airport. The now-closed Air Operations Unit previous flew a MBB/Kawasaki BK 117. It took delivery of a Eurocopter EC145 in April 2010, with its call sign being OSCAR 99. The unit was able scramble in two minutes and could reach most areas of the force within 15 minutes. Force crime department The force crime department contains the central units of the force's Criminal Investigation Department (CID), which also has detectives attached to the larger police stations. It is headed by the force crime manager, a detective chief superintendent. It also comprises the major crime branch, covert operations unit, intelligence unit, performance and co-ordination unit, scientific and technical services unit. Other departments The Contingency Planning Unit formulates long-term plans to deal with major incidents, including security for VIP visits, counterterrorist operations and reaction to terrorist attacks. The Force Planning and Consultation Unit formulates policy and plans and monitors public opinion on policing matters. The Professional Standards Department deals with force discipline