Flag display question...

[Fox 2/23]

I'm hoping my fellow Devil Dogs can help me out on a flag etiquette question. My brother gave me one of those small desk displays that holds three flags. He gave me the US flag, Marine Corps flag and POW/MIA flags. Of course the US flag goes in the center but what about the other two? Is there a rule covering them? Marine Corps flag on the left, POW/MIA on the right or vice versa? thanks bros.

[mrbsox]

My guess would be;

follow order of rank WHEN VIEWED.

By that, Old Glory in the center of course, but I'd go USMC on the left WHEN VIEWED, POW/MIA on the right.