General
(Gen.)
Commandant of the Marine Corps

Lieutenant General
(Lt. Gen.) Pay Grade: O10

Major General
(Maj. Gen.) Pay Grade: O9

Brigadier General
(Brig. Gen.) Pay Grade: O8

Colonel
(Col.) Pay Grade: O7

Lieutenant Colonel
(Lt. Col.) Pay Grade: O6

Major
(Maj.) Pay Grade: O5

Captain
(Capt.) Pay Grade: O4

First Lieutenant
(1st Lt) Pay Grade: O3

Second Lieutenant
(2nd Lt) Pay Grade: O2

The commissioned ranks are the highest in the military. These officers hold presidential commissions and are confirmed at their ranks by the Senate. US Marines officers are called company grade officers in the pay grades of O-1 to O-3, field grade officers in pay grades O-4 to O-6 and general officers in pay grades O-7 and higher.

Pay Grade: O1
Warrant officers hold warrants from their service secretary and are specialists and experts in certain military technologies or capabilities. The lowest ranking warrant officers serve under a warrant, but they receive commissions from the president upon promotion to chief warrant officer 2. These commissioned warrant officers are direct representatives of the president of the United States. They derive their authority from the same source as commissioned officers but remain specialists, in contrast to commissioned officers, who are generalists.

Pay Grade: W1

Chief Warrant Officer
(CWO5)

Chief Warrant Officer 4
(CWO4) Pay Grade: W5

Chief Warrant Officer 3
(CWO3) Pay Grade: W4

Chief Warrant Officer 2
(CWO2) Pay Grade: W3

Warrant Officer 1
(WO) Pay Grade: W2

At the E-8 level, the Marine Corps have two positions at the same pay grade. Whether one is, for example, a master sergeant or a first sergeant in the Marines depends on the person's job. The same is true for the positions at the E-9 level. Marine Corps master gunnery sergeants and sergeants major receive the same pay but have different responsibilities. All told, E-8s and E-9s have 15 to 30 years on the job, and are commanders' senior advisers for enlisted matters.
A third E-9 element is the senior enlisted person of the Marine Corps.
The sergeant major of the Marine Corps is the spokespersons of the enlisted force at the highest levels of their services

Sergeant Major of the Marine Corps
(SgtMajMC)Pay Grade: E8

Master Gunnery Sergeant
(MGySgt) Pay Grade: E9

Sergeant Major
(SgtMaj) Pay Grade: E9

Master Sgt, First Sgt
(Msgt) (1SG) Pay Grade: E9

Service members in pay grades E-1 through E-3 are usually either in
some kind of training status or on their initial assignment.
The training includes the basic training phase where recruits are immersed in military culture
and values and are taught the core skills required by their service component.
Basic training is followed by a specialized or advanced training phase that provides recruits with a specific area of expertise or concentration.
In the Marines, this area is called a military occupational specialty (MOS)

Corporal
(CPL) Pay Grade: E5

Lance Corporal
(LCpl) Pay Grade: E4

Private First Class
(PFC) Pay Grade: E3