From Halopedia, the Halo wiki
Helena Roman was a Marine tank commander attached to the UNSC Spirit of Fire. She participated in the Second Battle of Harvest in 2531, and was killed during an engagement against the Covenant in Harvest's northern polar region, courtesy of a Banshee squadron.
Helena Roman was born to her parents including a Doctor Roman. Later in life, Helena joined the UNSC Marine Corps and was served as a tank commander in the force deployments of the UNSC Spirit of Fire.