Sigtrygg
Emperor Mongoose
Pretty much yes. In the days of Empire the Royal Marines were essentially the Royal Navy Infantry, ship's troops, base guards etc at he said.@Sigtrygg: Would you say that what Tytalan said above would have been essentially correct prior to the Second World War?
Even as some were redesignated and trained to commando standards there were still Marine units assigned to their old jobs, which did include manning some of the big guns on capital ships
Post WWII was when the change to commando status for every RM became a thing, the British Army discontinued commando units, and with the reduction of British Armed forces post war and decline of Empire the RM lost all their roles appart from commando.