- "Hey, did you hear the rumors?"
"Yeah, the T-15s have been marked obsolete."
"Oh, boy. It's about time for that."
- ―A pair of stormtroopers discuss the T-15
The T-15 was used by the Galactic Empire until it was rendered obsolete.
The T-15s were marked obsolete by the time of the Battle of Scarif, as discussed by two stormtroopers right before being knocked out by Chirrut Îmwe. They implied when discussing this that they were looking forward to them being designated as such.