Private
From Halopedia, the Halo wiki
Template:Rank Infobox Private is the lowest enlisted rank of the UNSC Marine Corps and UNSC Army, and is equal in rank to Crewman Recruit in the UNSC Navy and Airman Basic in the Air Force. For most recruits into the Marine Corps and Army, upon completing basic training, they become a Private, and are further assigned to a specific unit.