Dorian Collins (Sovereign)

Ensign Dorian Collins was a Starfleet officer in the late 24th century. (, Star Trek: Sovereign)

Starfleet Academy
As a cadet at Starfleet Academy, her performance stood out among many of her peers, and she was invited to join the elite cadet group known as Red Squad. As a member of Red Squad, she was assigned to the USS Valiant (NCC-74210) for field training exercises when the Dominion War broke out and was attacked, resulting in the loss of all of the supervising instructors.

USS Valiant
She was given a provisional rank of Chief Petty Officer by Cadet Tim Watters, who had assumed command of the ship. She served aboard the Valiant until acting Captain Watters went on a foolhardy pursuit of a Jem'Hadar battleship. She was the only Red Squad cadet to survive. 

Recovery
She later returned to Earth for counseling for several weeks talking about what happened deep in former Dominion-held space during the war, and she was being reviewed.

Returned to Starfleet Academy
She was later returned to the academy, where she maintained excellent grades in her academic pursuits, but was falling behind on field work. One of her teachers, Admiral Belding, recommended her for additional field duties aboard the USS Sovereign. (episode: Picking up the Pieces)