CBRN
The abbreviation CBRN has been in use in the UK military since 2005. R (Radiological) refers to hazards from harmful radioactive substances, and N (Nuclear) refers to hazards specifically from nuclear weapons detonations, which includes nuclear radiation, but also includes thermal radiation and shock waves. The predecessor to NBC was ABC, where the A stood for Atomic.
The specialist CBRN role will soon transfer from the RAF Regiment to the Army, because David Cameron said the Army would not go below a certain strength, and this meant jobs had to be found for them. (This a couple of years after his Government decided the role should be left solely to the RAF after the failed experiment of the Joint CBRN Regt). I can't imagine a more compelling reason for changing a proven model, in such a complex and dangerous field.
Thank goodness terrorists and despots aren't determined to obtain and use CBRN weapons.