A-11, aka Cer, was a ARC trooper sergeant who fought during the outbreak of the Clone Wars. He served and fought under his superior officer, ARC-Trooper: Delta-3530 in the 353rd Legion. Towards the years leading up to the Battle of Geonosis, Aiden was one the few Fett-bred clones that Delta-3530 personally selected to train and serve under him in the 353rd Legion. Like Doxx, Typho, Barddock, Brock, Pierce, Darnell, and Grayson, Aiden would be the first clone sergeant whom Gohan would personally train. Like the others, Aiden was trained with Delta-ARC training skills, from Gohan.