Volunteer units within the NZFS organisation also provided support services over and above the role of the Firefighter. Various Operational Support Units (OSUs) manned by volunteers were attached to Fire Districts and Brigades across New Zealand, which provide non-firefighting assistance at large-scale incidents. These include traffic and crowd control, scene cordons and lighting, basic first aid, salvage, communications and logistics, and even catering. The biggest of them, Auckland Operational Support Unit, also known as the Auckland Volunteer Fire Brigade, was also the biggest volunteer fire brigade or unit in New Zealand with a membership of 60 and in the 2015 calendar year, members responded to more than 700 incidents.