Sergeant is a rank within the police force. The most well known Sergeant is SRU: Team One Team Sergeant, Gregory Parker. Another mentioned Sergeant is Troy. Yet another Sergeant was Roland Cray, promoted in Scorpio. Spike's mentor Oliver McCoy, was also a Sergeant. At the end of the series, Constable Ed Lane was promoted to Sergeant in Team One.

The Team Sergeant is suppose to be the leader of the team as mentioned by Dr. Toth and almost always leads the negotiation. The Team Sergeant works with the Team Leader to plan each SRU mission.

Trivia: Greg was the Team Sergeant for Team One. Troy was the Sergeant for Team Four. Team Three's Sergeant was never mentioned, despite Donna Sabine being its Team Leader.