 The Defence CBRN (Chemical, Biological, Radiological and Nuclear) School is the instructional element of the centre.Its mission is to deliver the UK's CBRN Defence Training for Operations on land.The 10-day CBRN Defence Advisors' is aimed at military officers within a battlegroup or unit who have responsibility to assist/ advice the commander in the planning and execution of CBRN measures and unit CBRN training, or who fill CBRN staff appointments.