 The centre is responsible for all training issues relating to chemical, biological, radiological and nuclear (CBRN) defence and warfare for the UK's armed forces.It is also the home of the National Ambulance Resilience Unit's Training & Education Centre which, among other things, is responsible for training the NHS ambulance service's Hazardous Area Response Teams (HART).The site was established as an element of the Porton Down research facility in 1917.