The document discusses the UK's chemical, biological, radiological and nuclear (CBRN) protection capabilities and challenges. It notes that terrorism and state threats involving CBRN weapons are top national security risks. The UK's policy is for armed forces to be able to "survive and operate" in all CBRN environments, but current capabilities to detect and treat CBRN hazards remain difficult. Various projects are underway to improve protection, but continued investment is needed to address this evolving threat.