Job: Rank Display

I need a rank display addon that can display ranks above players heads. Id also like for there to be a menu or a command that admins or whitelisted individuals can use to give players those icons instead of it being name based. If it is a menu id like for it to display everyone and then when you right click on their name it would show a dropdown display of the ranks and you can just pick the rank. If it is a command it should just be something like !promote and then it promotes the player to the next rank like PVT -> PFC.