40px-Terminal.png This article, United Nations Space Command (AAO), was written by Maslab. Please do not edit this fiction without the writer's permission.
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United Nations Space Command
Political information
Type of government

Emergency Military

Founding document

United Nations


Democracy/Emergency military

Head of State
Head of Government

Unified Earth Government

De facto leader

Admiral Andrew Gering

Executive branch

UNSC Security Committee

Legislative branch

UNSC Security Council

Judicial branch

Office of Investigations[1]

Societal information


Official language

English (Primary), Spanish, Japanese, Swahili and many others



State religious body


Historical information
Formed from

United Nations, 2160

Date of establishment

December 2163


The United Nations Space Command is the Unified Earth Government military branch.


The period following the end of the Human-Covenant War was one fraught with power struggles and peril. Fleet Admiral Terrence Hood stepped down as the de facto leader of the UNSC and handed the reins off to Admiral Andrew Gering.

With the passing of the Reformation Act of 2555 the UNSC gained an influx of funds, technology, and recruits. While the Covenant seemed to be, for the moment, consolidating their forces and rebuilding, the leaders of the UNSC knew they had to do so as well.


  • 2565- amount of Covenant raids rise, and the UNSC retaliated with new weapons designed to disrupt plasma weaponry and won several crushing blows against the invading zealots.
  • 2567- Delta Company begins active duty. The new Spartans prove incredibly effective.
  • 2568- Spartan III program goes public. Standoff on Syndicate-5 ends with a flawless victory over Covenant Loyalist forces. Discovery of the Judicator later in the year.
  • 2569- Precursor structure discovered on Sanghelios with active Flood forms inside. Science team sent to investigate after the outbreak is successfully contained. The Fallen disband after being dealt a massive blow by a team of Spartan IIIs.
  • 2570- A massive victory over a small Covenant Loyalist invasion fleet during the Battle for Kennedy Space Port delays several other pushes. Huragok officially join the Interspecies Union. Technological innovation accelerates dramatically.
  • 2572- Flood outbreak observed and contained. Colony of Resolution glassed. The Path Walkers are discovered. Stalemate at Falaknuma begins.
  • 2573- Stalemate at Falaknuma ends with UNSC victory. A single Spartan and a Sangheili Field Master flee the battle with a Forerunner artifact.

Branches of the United Nations Space Command


The UNSC Navy is the primary source of transportation and offensive capabilities in the UNSC.

UNSC Navy Chain of Command

  • Political
    • Chairman of the Unified Earth Government
    • Secretary of Defense
    • Secretary of the Navy
  • Administrative
    • Chief of Naval Operations
    • Vice Chief of Naval Operations
    • Director, Naval Staff
    • Master Chief Petty Officer of the Navy
  • Operational
    • Unified Combatant Commanders
    • Fleet Commanders


The Marines are the UNSC's primary offensive ground force.

Marine Corps Command Structure


The UNSC Army's role is that of defense, often holding heavily guarded bases on important planets.

UNSC Army Command Structure

Air Force

The UNSC Air Force serves a similar role to the Army. They primary use heavy fighters and interceptors.

UNSC Air Force Command Structure

Ranking System

The UNSC ranking system was re-established in 2555 in accordance to the formation of the Interspecies Union. There were a few minor changes in rank names as well as their respective roles in the military. Additional changes include:

  • Identical insignias for all branches, difference in branches distinguished by shoulder-patch color.
  • Additional usage of insignia and correspondingly minimized usage of imagery to make ranks easier to identify and differentiate.
  • Omitting of human-exclusive symbols that are more difficult to identify by other member species (Oak leaf, eagle, anchor, shield, etc.).
  • Re-designation of the Army's E-2 and E-3 ranks to align with the Marine Corps'.
  • Re-designation of the Air Force's E-5 through E-8 ranks to align with the Army and Marine Corps' ranks.
  • More reflective of United Nations representation as a whole as opposed to merely the (defunct) United States'.
[Source] ˑ [Edit] List of UNSC Ranks in Against All Odds
Rank Expeditionary Forces Occupying Forces
Marine Corps Navy Army Air Force
Non-commissioned Officers
Reach - Sergeant E-1 Private Crewman Recruit Private Airman Basic
Reach - Sergeant Grade 1 E-2 Private First Class Crewman Apprentice Private First Class[2] Airman
AAO E-3 E-3 Lance Corporal Crewman Lance Corporal[3] Airman First Class
Reach - Sergeant Grade 2 E-4 Corporal Petty Officer Third Class Specialist Senior Airman
AAO E-5 E-5 Sergeant Petty Officer Second Class Sergeant Sergeant[4]
AAO E-6 E-6 Staff Sergeant Petty Officer First Class Staff Sergeant Technical Sergeant
AAO E-7 E-7 Gunnery Sergeant Chief Petty Officer Sergeant First Class Chief Technical Sergeant[5]
AAO E-8 E-8 Master Sergeant Senior Chief Petty Officer Master Sergeant Master Sergeant[6]
First Sergeant First Sergeant
AAO E-9 E-9 Master Gunnery Sergeant Master Chief Petty Officer Sergeant Major Chief Master Sergeant
Sergeant Major Force Master Chief Petty Officer Command Sergeant Major Command Chief Master Sergeant
Fleet Master Chief Petty Officer
Command Master Chief Petty Officer
Sergeant Major of the Marine Corps Master Chief Petty Officer of the Navy Sergeant Major of the Army Chief Master Sergeant of the Air Force
Warrant Officers
Reach - Captain W-1 Warrant Officer 1 Warrant Officer 1 Warrant Officer 1 Warrant Officer 1
Reach - Captain Grade 1 W-2 Chief Warrant Officer 2 Chief Warrant Officer 2 Chief Warrant Officer 2 Chief Warrant Officer 2
Reach - Captain Grade 2 W-3 Chief Warrant Officer 3 Chief Warrant Officer 3 Chief Warrant Officer 3 Chief Warrant Officer 3
Reach - Captain Grade 3 W-4 Chief Warrant Officer 4 Chief Warrant Officer 4 Chief Warrant Officer 4 Chief Warrant Officer 4
AAO W-5 W-5 Chief Warrant Officer 5 Chief Warrant Officer 5 Chief Warrant Officer 5 Chief Warrant Officer 5
Commissioned Officers
AAO O-1 O-1 Second Lieutenant Ensign Second Lieutenant Second Lieutenant
AAO O-2 O-2 First Lieutenant Lieutenant (junior grade) First Lieutenant First Lieutenant
AAO O-3 O-3 Captain Lieutenant Captain Captain
AAO O-4 O-4 Major Lieutenant Commander Major Major
AAO O-5 O-5 Lieutenant Colonel Commander Lieutenant Colonel Lieutenant Colonel
AAO O-6 O-6 Colonel Captain Colonel Colonel
Flag Rank Officers
AAO O-7 O-7 Brigadier[7] Commodore[8] Brigadier[7] Brigadier[7]
AAO O-8 O-8 Major General Rear Admiral Major General Major General
AAO O-9 O-9 Lieutenant General Vice Admiral Lieutenant General Lieutenant General
AAO O-10 O-10 General Admiral General General
AAO O-11 O-11 General of the Marine Corps Fleet Admiral General of the Army General of the Air Force
Standard RankNon-standard RankWarrant Officer



  1. The Office of Investigations most likely investigates and judges the actions of all the arms of the UNSC, as it is the only known judicial organization of the UNSC.
  2. Private grade 2: Defunct as of 2555
  3. Private First Class (Army): Switched to E-2 as of 2555
  4. Staff Sergeant (Air Force): Defunct as of 2555
  5. Master Sergeant (Air Force): Switched to E-8 as of 2555
  6. Senior Master Sergeant: Defunct as of 2555
  7. 7.0 7.1 7.2 Brigadier General: Defunct as of 2555
  8. Rear Admiral Lower Half: Defunct as of 2555