The Reprogrammed Turret is a Sentry Turret reprogrammed by one of the survivors of the neurotoxin incident to protect the Extended Relaxation Annex from GLaDOS or the ones who are sent by GLaDOS, this time is the Co-op initiative.
Appearance
The turret itself is the same as a normal sentry turret, the only difference is the turret's voice line. Rather than saying the normal voice line, the turret says that it "need to protect humans".