Os oficiais podem ser distinguidos de duas maneiras. Oficiais de stormtrooper 'padrão':
Stormtrooper officers were traditionally non-clone graduates from the Imperial Academy, but Imperial stormtroopers who demonstrated skills in leadership could be promoted to officer status. In battle, commissioned stormtrooper officers wore standard armor with rank insignia to indicate status.
Também existiam comandantes de stormtrooper:
The stormtrooper commanders were separate from the regular officers in the Stormtrooper Corps. Highly skilled in combat and leadership, the commanders were modeled after the ARC troopers, elite clone troopers that fought for the Galactic Republic during the Clone Wars. As a result, they were widely regarded as superior soldiers to the more common Imperial stormtroopers. Because of their special status, the commanders were entrusted with command over the Empire's shadow troopers and were given authority to utilize them at their own discretion without requiring any clearance from Imperial High Command. As an anomaly within an organization that stressed absolute uniformity, the stormtrooper commanders were easily noticeable due to the blue markings on their armor
NCOs também podem ser identificados em armaduras:
Non-commissioned officers were identified in the field with shoulder pauldrons instead of the standard rank squares worn over the armor.
Todas as fontes são de aqui . O único problema é que, até onde eu vi, nunca vemos nenhum stormtroopers com essas marcas distintivas. Como as tropas de assalto recebiam ordens de oficiais imperiais, poderíamos nunca ter visto oficiais de stormtrooper reais ou NCOs nos filmes.