Not really. I'm planning my usual two-character setup, and your CO (one of my chars) will be a WW2 veteran, fighting from Gold Beach in 47 Commando to the Malay Crisis in the Far East, to the Cyprus Emergency far more recently, transferring to 40 Commando instead. He's made office over that time, and is going to be one of the most hard-as-nails characters I've made. This is someone almost remorseless- beard and all, and will be generally quite an intimidating bloke, even for a Royal Marine. A real Psychopath, if you will, when he yells at people you don't exactly ignore him.

The other will be the fresh-faced opposite, a Middle-Class boy basically, at 17. Brought in by National Service and he thought going into the Royal Marines like his dad did will do him proud. Some training later, and well...he isn't anywhere like the above, but perhaps looks to kinda get through the ordeal. 

I guess having a mixed bag of characters would be nice. I would want one or two lifers, people who have already fought in one conflict- then we can get more National Service people in, and see how that goes. Ranking wise, they could always be Corporals, or Privates, even if they fought in the 'War.