Corporal (UNSC)
From Halopedia, the Halo wiki
Corporal is the fourth enlisted rank in the UNSC Marine Corps as well, ranking immediately above Lance Corporal and immediately below Sergeant. Corporal is the lowest grade of Non-commissioned officer in the UNSC Marine Corps, though promotion to Corporal traditionally confers a large jump in authority and responsibility compared to promotion from Private through Lance Corporal.
