Stormtrooper Squad Leader

Squad Leaders are the officers of stormtrooper squads. They can be identified by the orange pauldron they wear on the right shoulder of their armor. They are otherwise statistically identical to stormtroopers, and may be found wherever stormtroopers are.

Star Wars Lore
Stormtrooper officers were traditionally non-clone graduates from the Imperial Academy. In battle, commissioned stormtrooper officers wore standard stormtrooper armor with rank insignia to indicate status. Non-commissioned officers were identified in the field with shoulder pauldrons instead of the standard rank squares worn over the armor. For non-combat situations, officers wore a black tunic and pants dress uniform including a cap, boots, gloves, and standard rank squares.