A rarity in the military of the Cardassian Union, the female Ocett chose to join the military after learning that she was unable to conceive children. With family being the highest ideal of the Cardassian people, Ocett knew that it was unlikely that she would ever find a permanent mate, and saw a military career as a way to travel and do things few Cardassian women ever did.
In 2345, while serving as a Dalin in command of the scoutship Kevalu, Ocett discovered the gelatinous lifeform that eventually became known as Odo while patrolling the Denorios Belt in the Bajoran sector. (ST - Terok Nor novel: Night of the Wolves)
By 2369, Ocett had been promoted to the rank of Gul. The same year, Ocett sought out what she believed to be a source of unlimited power whose location was hidden in the DNA of various Alpha Quadrant species. (TNG episode: "The Chase")
During the Dominion War, Ocett became a member of Corat Damar's resistance movement. She was the only resistance leader who survived when the cells were betrayed by Gul Revok. Following the Dominion's destruction of Lakarian City, her influence was largely responsible for Cardassian forces turning on the Dominion. After the war, Ocett aligned herself with the Directorate, a political group hoping to restore Cardassia to its former glory. (DS9 novel: A Stitch in Time)