Corporal

Corporal is the fourth enlisted rank in the UNSC Marine Corpsand the UNSC Army, and also the lowest rank of theNon-Commissioned Officer (NCO). It is equal in rank to Petty Officer Third Class the UNSC Navy and Senior Airman in the UNSC Air Force.

promotion to Corporal traditionally confers a large jump in authority and responsibility compared to promotion from Private through Lance Corporal.

While both UNSC Army  and the UNSC Marine Corps share the rank of Corporal, the UNSC Marine Corps promotes Lance Corporals directly to Corporal. Most  of the time in the Army, Privates First Class (which are E-3) are promoted to Specialist, and then directly  o Sergeant. In some cases, however, they may get promoted to Corporal instead of Specialist depending on combat tours or other military jobs.

Air Force

 * Airman Basic
 * Airman
 * Airman First Class
 * Senior Airman
 * Staff Sergeant
 * Technical Sergeant
 * Master Sergeant
 * Senior Master Sergeant
 * Chief Master Sergeant
 * Command Chief Master Sergeant
 * Chief Master Sergeant of Air Force

Army

 * Private
 * Private First Class
 * Specialist
 * Corporal
 * Sergeant
 * Staff Sergeant
 * Sergeant First Class
 * Master Sergeant
 * First Sergeant
 * Sergeant-Major
 * Command Sergeant-Major
 * Sergeant Major of the Army

Marine Corps

 * Private
 * Private First Class
 * Lance Corporal
 * Corporal
 * Sergeant
 * Staff Sergeant
 * Gunnery Sergeant
 * Master Sergeant
 * First Sergeant
 * Master Gunnery Sergeant
 * Sergeant-Major
 * Sergeant-Major of the Marine Corps