 The service also support a number of emergency charities, such as air ambulances, who provide doctors for serious incidents.The Trust controls the mobilisation of critical care charities throughout its area.These include Magpas (HEMS), Essex & Herts Air Ambulance (HEMS), East Anglian Air Ambulance (HEMS), BASICS Essex Accident Rescue Service (BEARS), SARS, NARS and BASICS Hertfordshire.