CT-915 was born in 32 BBY on the planet of Kamino, alongside his brother CT-914. The two troopers spent all of their time together, as they were birthed in the same pod unit. The two graduated together and were deployed when the Clone Wars began.
In 20 BBY, CT-914 and CT-915 were deployed to Drognar where the Republic and Separatist forces were fighting over fields of Bota, a highly valuable plant with medicinal factors. On Drognar, the two were assigned to the same cohort. Sometime later, CT-915 was injured in battle. 914 helped transport his brother to the Republic Medical Surgical Unit 7 and the local surgeons fought for the trooper's life. The surgeons fought for 915's life, while his brother waited outside. CT-914 was informed that CT-915's death and he grieved his brother's death until his own during an ambush.
- Medstar I (First mentioned)
- Medstar II (Mentioned only)