Emperor Lelouch's Royal Guards and Britannian soldiers the same?Edit

I notice that during the battle of Mt. Fuji, there were a lot of Royal Guards shown in the grounds, Gareth, and the conquering of Damocles. But there were Britannian soldiers shown during Emperor Lelouch's ascension to the throne. People refer to Lelouch's Royal Guards as slave soldiers and his soldiers during his reign. But according to the Britannian Military Royal Guard section, it is said that those who wear the cape are the commanding officers of the guard and most of them are shown at Pendragon when geassed. Those without the cape are shown at the battle though.