CT-5/373 was born in 32 BBY on Kamino. The trooper received basic training and eventually graduated. In the year 22 BBY, he was sent to the First Battle of Geonosis, the first battle of the Clone Wars.
The trooper was deployed in a Low Altitude Assault Transport/infantry where he landed in the arena, where the Jedi they were sent to rescue were. 5/373 exited the craft, fighting against the Separatist droids and the Geonosians, while the Jedi evacuated into the transports.
The trooper was able to escape the arena with the strikeforce, to be deployed outside in the desert, where he fought droids of all sorts on all fronts. The trooper managed to survive the conflict and serve the Republic.
- Star Wars: Episode II: Attack of the Clones