Master Sergeant Sousa is a neurally resocialized marine master sergeant in the Dominion Armed Forces. The resoc left him perpetually "chipper". His status was theoretically secret, but it was well-known to troops in his command. As a high-ranking NCO, he was the superior to the older First Sergeant Isaac White, a marauder who specialized in disarming explosives. Sousa reported to Commander Rindge.