How might the Royal Marines have evolved without adopting the commando role in the Second World War?
Short answerThey would still have developed as brigade-sized naval-base and amphibious-warfare specialists.
NotesThe Royal Marines had a durable institutional base long before the Second World War commandos. They had already been organized into several brigades and used to protect mobile naval bases. Their natural specialization was amphibious warfare, including the seizure and security of beaches. The Army tended to claim that mission only when war or a competitive spending review made amphibious capability urgent.