From Halopedia, the Halo wiki
Roggan was the fifth captain of the Phoenix-class colony ship, UNSC Spirit of Fire, succeeding Captain Johnson. Captain Johnson's service as captain ended in 2505, but the position was not filled again until 2507 by Roggan. Under Captain Roggan, the Spirit of Fire aided in the UNSC's interstellar expansion efforts by transporting colonists and equipment for colonization, including pre-fabricated structures such as schools and hydroponics facilities. Captain Roggan served until 2513, when his or her position was filled by Captain Alexander. By 2531, Roggan's name and their period of service as captain were painted onto the side of the Spirit of Fire's hull.
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