Trey
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RC-1193 - also known as Trey - was a Republic Commando during the Clone Wars. He was raised as part of a Commando Squad on Kamino, along with brothers RC-1194, RC-1196 (Hex), and RC-1197 (Darven). At the Battle of Geonosis half of his Squad was killed; with Darven he joined RC-1987 (Riko) and RC-1990 (Zero) in a new unit, and served with them for much of the remaining war. Eventually, he was killed during Operation: Knightfall, while attempting to carry out Order 66.
Post-Reset
When the Senate finally agreed to approve the creation of the Grand Army of the Republic, Trey was among the already-matured clones that travelled from Kamino to Geonosis under the authority of Jedi Master Yoda. The Squad was engaged in Commando operations throughout the Battle of Geonosis, but unfortunately suffered casualties. In the aftermath of the battle, Trey and his similarly squadless brother Darven were involved in the search for survivors among the dead. (Shadows of the Republic: Spoils of War)
Pre-Reset
This character did not exist pre-Reset.