Chain of Command & Ranks 

Chain of Command: noun - a series of executive positions in order of authority.

The UNSC Marine Corps is structured by ranks with different objectives and responsibilities over the other. The chain of command is a system of organization that helps ranks understand who and what people and ranks to report to. The chain of command is the system that shows who is incharge of who and enforces responsibility, accountability, and stability.

The Chain of Command is heavily enforced by both high command and law enforcement officers. It is to be respected at all times and any acts of corruption and avoiding it will result in a harsh punishment.

The Chain of Command starts with Lieutenant and ends with the Commandant of the Marine Corps.

Marine corps high-command

Fleet Admiral - NobleJarrr

Commandant of the Marine Corps - Alphashadow13

Assistant Commandant of the Marine Corps - Undoneraven

Sergeant Major of the Marine Corps - Hentaper

Director of Marine Corps Staff - Starkillerben2

Inspector General of the Marine Corps - Mrcoollegacy

Commandant - The Commandant of the Marine Corps is the highest-ranking member of the UNSCMC and represents the Marine Corps on a large scale. 

Assistant Commandant - The Assistant Commandant of the Marine Corps is the CMC's right-hand man, The Assistant Commandant is tasked with supporting HQMC and directs major projects with the CMC.

Sergeant Major of the Marine Corps - The Sergeant Major of the Marine Corps has the command authority of an O9 and is the Senior Enlisted Advisor to the CMC regarding enlisted affairs, The SMMC manages all enlisted and non-commissioned officers' affairs, to ensure they are competent and conduct their actions in diligence and that their needs are being met.

Director of Marine Corps Staff - The Director of Marine Corps Staff is the principal assistant and advisor to the Commandant and Assistant Commandant and effectively and efficiently coordinates Division Commanders and their direct subordinates to ensure the divisions are productive.

Inspector General of the Marine Corps - The IGMC facilitates Marine Corps efficiency, integrity, and institutional readiness through objective and independent assistance, assessments, inspections, and investigations to enhance the Marine Corps mission success and the welfare of its Marines.

Ranks

ENLISTED

Junior Enlisted:

1. E-1 Private

2. E-2 Private First Class

3. E-3 Lance Corporal

Non-Commissioned-Officers:

1. E-4 Corporal

2. E-5 Sergeant

Staff Non-Commissioned Officers:

1. E-6 Staff Sergeant

2. E-7 Gunnery Sergeant

3. E-8A Master Sergeant

4. E-8B First Sergeant

5. E-9A Master Gunnery Sergeant

6. E-9B Sergeant Major

7. E-9C Sergeant Major of the Marine Corps 

COMMISSIONED OFFICER

Company-grade officer:

1. O-1 Second Lieutenant

2. O-2 First Lieutenant

3. O-3 Captain

Field-Grade officers:

1. O-4 Major

2. O-5 Lieutenant Colonel

3. O-6 Colonel

Generals:

1. O-7 Brigadier General

2. O-8 Major General

3. O-9 Lieutenant General

4. O-10 General

Commissioned officers

Second Lieutenant (2ndLt) - O1

Fresh out of OCS the second lieutenants are in charge of leading platoon or company level units. Reporting to their senior officers for assistance, guidance, and intent.

First Lieutenant (1stLt) - O2

First Lieutenant are incredibly similar to that of a 2ndLt but with an increase of responsibility when hitting this rank. They are typically company leaders or excutive officers.

Captain (Capt) - O3

The Captain is responsible for leading entire companies of Marines usually as the company commander of a unit. A vital role in operations with the assistance of their junior officers and senior enlisted NCOs.

Major (Maj) - O4

The Major is seen usually acting as a battalion’s executive officer or second in command, essentially a Captain with in incredible responsibility increase.

Lieutenant Colonel (LtCol) - O5

Being battalion commanders the Lieutenant Colonels typically are the decision makers of a(n) operation and are the main leaders of a unit.

Colonel (Col) - O6

Regimental Commanders, brigade executives, or simply a divisional staff member. The colonel is usually apart of the high command of their respected unit.

Brigadier General (BGen) - O7

A one-star general, hand-picked by the CMC or Fleet Admiral and overlook the UNSC Marine Corps as a whole. They typically lead Infantry divisions or Aerial wing

Major General (MajGen) - O8

A two-star general, hand-picked by the CMC or Fleet Admiral and overlook the UNSC Marine Corps as a whole. They typically lead Infantry divisions or Aerial wing

Lieutenant General (LtGen) - O9

A three-star general, hand-picked by the CMC or Fleet Admiral and overlook the UNSC Marine Corps as a whole.

General (Gen) - O10

A four-star general, hand-picked by the CMC or Fleet Admiral and overlook the UNSC Marine Corps as a whole.

Assistant Commandant of the Marine Corps (ACMC) - O10

The Assistant Leader of the Marine Corps, also making them the second highest ranking officer in the Marines is a four-star general and serves a part of the Security Council.

Commandant of the Marine Corps (CMC) - O10

The Leader of the Marine Corps, also making them the highest ranking officer in the Marines is a four-star general and serves a part of the Security Council.

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Credit to marines.com