The Clone Trooper Commander can be easily identified by his unique yellow markings. This skin is based off of the live-action Phase 1 Clone Trooper armor from Star Wars Episode 2: Attack of the Clones.

"Clone trooper commanders, also called clone commanders, were clone troopers bred on Kamino for leadership roles in the Grand Army of the Republic or they worked themselves up in battle. They fought in the galaxy-wide conflict known as the Clone Wars." - Wookieepedia

I'm out of the phase 1 clones from the second Star Wars movie, comment below what clones units I should do next!