Corporal (UNSC)
From Halopedia, the Halo wiki
Template:Rank Infobox Corporal is the fourth enlisted rank in the UNSC Marine Corps and is the lowest rank of non-commissioned officer. It is equal in rank to Petty Officer Third Class in the UNSC Navy.
Promotion to Corporal traditionally confers a large jump in authority and responsibility compared to promotion from Private through Lance Corporal.