Pursuer, a , tactical RIB. Mutual Aid Support Team The Mutual Aid Support Team (MAST), consists of police officers that have taken on further training to deal with less routine incidents such as large scale or more violent public disorder or policing events where it is likely to occur. In other forces MAST is sometimes known as the Territorial Support Group or L2. Other support units There are many units that support the above Operational units, which include: the Planning and Policy Unit, The Critical Incident Cadre (which is designed to provide tactical support in the event of any major incident within the force area), the Scientific Services unit (which consists of the Crime Scene Investigators), Special Branch and both the Serious Organised Crime and Major Crime units. Uniform, equipment and vehicles Headgear Male constables and sergeants of Hampshire Constabulary wear the traditional comb-style custodian helmet when on foot patrol. However, Hampshire is one of only three other UK forces that does not use the common Brunswick star style force badge, favouring instead a large metal plate that mirrors the county crest, depicting a laurel wreath enclosing a crowned rose above a banner that reads 'Hampshire'. The helmets worn by constables have larger helmet plates of uncoloured white metal whilst those worn by sergeants have slightly smaller helmet plates that includes blue and red enamelled detail on the crown, rose and county title. The helmet plate worn by constables is the largest of all those worn by forces in England and Wales and ensures that they stand out in the company of officers from other areas. Officers wear a peaked cap with black and white chequered hat band when on mobile patrol in vehicles whilst Roads Policing Unit (RPU) officers wear a similar cap with a white top. Female officers wear a bowler hat (with black and white chequered hat band), or a similar bowler hat for female RPU officers but with a white top. PCSO's wear peaked caps with a blue hat band. Each of these caps have smaller versions of the helmet plate. Officers holding the rank of Police Inspector or above wear peaked caps. Uniform When on duty, Frontline Police Officers wear a black, wicking T-shirt with the word 'Police' on the sleeves, and black uniform trousers. Hampshire officers no longer use the traditional police jumper, having favoured a black fleece with 'Police' written on the chest