Detailed Description:
“Sir yes sir!” - Every Marine at one point or another.
As a Military Cadet your sole job is to learn Marine Law and how to perform basic operations by yourself. This will likely be at the hands of the Senior Enlisted Advisor if they aren't busy explaining how to walk to some jarhead fresh out of cryosleep; if you start as this role, you are that jarhead.
The MC role is required for all marine roles and exists so you can learn the basics of Marine Law and how to play, so you don't end up lost or confused when playing a command role. If you signed up as a Cadet from another role, it is assumed you know the basics of navigation and the SEA can focus on the finer details of combat training; if you emerge fresh from Cryosleep, the SEA should walk you through your paces.