During my service with HM Forces, I got the impression that the more famous the regiment, the more gung-ho the men in that regiment,(paras-marines-guardsmen etc.) and the more likely they were to be sent into "action", but the less inteligent those guys seemed to be. Thats the rank & file. The officers were just the opposite. It appeared to me that the stupider the men were, the more brains it took to lead them.
I was in a lowly transport outfit, whos men were largely of a high I.Q.
Our officers tho, thats another story altogether.
Pull up a sand-bag (find yerself a seat) and I'll tell yez a few stories......heh heh.