Forum:KB:Clone rank structure. . . .

Is there anything explaining the Clone rank structure, besides color? I'm asking because seeing as midway through the Clone Wars color no longer denoted rank, but instead showed which unit a Clone was a part of. I'm curious on how they differentiated each other. Also, I wanted to know how Clones with no identifying marks (i.e. privates. . . .) were able to be kept track of during conflicts. I ask because I know that in war, organization and accountability of your own forces is key.