Stisen was a member of the Utgard Constabulary. He enlisted in the Colonial Militia of Harvest and was placed in Second-Alpha Squad. Stisen was one of the older members of the Colonial Militia. He was eventually promoted to 2nd platoon's Alpha Squad leader. He was known to be pushy to the other recruits and arrogant due to their inexperience compared to his job as a constable on Harvest. He presumably survived the Battle of Harvest, and joined the UNSC Marine Corps at Johnson's offer.