Armories and military offices world wide have a wall featuring the chain of command. Here is a picture of part of the one in my building. Note the guy to the left of Governor Otter.
Rank goes lower as you move from the left side to the right. The Commander In Chief is on the far left, of course. Also, I think it's pretty neat that in our system, we prominently display the civilian leadership of the military.
Update; fixed some odd syntax about rank.