The Royal Armoured Corps helmet is a combat helmet of British origin worn by Armoured Troops as well as Royal Navy and Royal Marines. It was introduced in WW2 and was issued to commonwealth countries in the post-1945 era up to the Falklands War. The RAC helmets came with the same suspension and liner from the Brodie helmets and later the elasticated suspension and liner from the MkIII helmet. Also to note that many were converted to use as a Paratrooper Helmet.
The RAC helmet is not to be confused with the tanker helmet or the Despatch rider helmet.