The Royal Marines work in small groups, maximum of forty to a troop which is deployed in various theatres, each unit will specialise in different areas, i.e a mountain troop, arctic troop etc. With amphibious assault teams working in teams of 8. they are a strike force, All RM´s undergo Commando training, it is an extremely gruelling training regime with a high failure rate. When basic training is done they then train to specialise in certain aspects, these can be communications, catering, engineering, so each troop has a varied range of skills to fall back on. As stated before, you have to be at U.S Marine level just to be considered. They truly are an awsomely effective force. Small, well trained well armed. a troop of 40 held the Falkland islands against the Argentine invasion for over 6 hours without a single loss of life. Theyre daring raids against the Germans during WW2 caused havoc for the enemy, and ultimately led David Stirling to put together the S.A.S. which if you havent heard of them, its the "Special Air Service", Just think of "Delta Force" but on steroids.