This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
Commander Joann Owosekun was a female Terran who served as a Starfleet officer in 23rd century. She was the leader of Emperor Philippa Georgiou's Honor Guard, and in 2255 she became the security chief of the newly launched ISS Charon.
She bore a medal on her uniform identifying her as a member of the bridge crew.
Joann Owosekun was played by actress Oyin Oladejo.