INTRODUCTION

In many ways the Humans military organization is made up like our own. Warriors of different classes, leaders, politicians, spies and special operatives. A structure that they use most efficiently.   

The United Earth Government (UEG), and United Nations Space Command (UNSC) were formed by the UN when over-population on Earth started becoming a problem in the early 22nd century. The UNSC Navy is Earth's premiere defense against the Covenant. The Navy houses the divisions of Marines, Orbital Drop Shock Troops, and Office of Naval Intelligence. Originally designed to keep the peace between neighboring planets and star systems, when certain rebellious factions began to rise in the late 2510s the UNSC was forced to police it's colonies to keep privateers, and pirates from raiding them. After Harvest colony was destroyed, one badly damaged UNSC ship returned to tell the tale of monstrous alien ships that utterly destroyed the colony. The UNSC doubled it's shipbuilding to bolster themselves against the Covenant, but it was for naught, for the Covenant's technology was far superior to mankind's. The UNSC fortified major positions such as Reach, the UNSC's main shipyards and command center, and Earth. So far, the UNSC is losing the Covenant war, and the only end in sight seems to be utter annihilation.

ARTIFICIAL INTELLIGENCE (A.I) 

Artificial Intelligence was developed by the UNSC in cooperation with ONI. The process of creating an AI is different than most people realize. Instead of simply "programming" an AI, the AI matrix is actually created by sending electric bursts through the neural pathways of a human brain which are then replicated in a super conducting nano-assemblage. This destroys the original brain tissue however, and so the brain being used could only be obtained after the host had died. However, in some instances, as in the case of the AI "Cortana", the candidate brain was flash-cloned and had it's memories transferred to the receptacle organs so that the host, Dr. Catherine Halsey, could remain alive.

Most AIs give themselves a unique appearance that corresponds to their main use. "Smart" AIs, or AIs that are not confined to their one purpose, have a normal operational life span of about seven years. Because the "smart" AI is subject to an established memory core which cannot be replaced, the more the AI collects data, the less "thinking" space it has to work with. An AI literally "thinks" itself to death. "Dumb" AIs do not have this problem as they do not learn anything that is outside of their set limits of dynamic memory processing matrix. They are quite useful in their particular field of expertise, but very limited. Smart AIs can function and learn as long as they are active.

Cole Protocol states that capture of an AI by the Covenant is unacceptable. When in danger of capture, AIs are to be terminated, and completely erased. 

Example names of UNSC AIs include Cortana, Beowulf, Deja, Araqiel, Kalmiya, Lysithea, and Wellsley.

COLONIAL MARINES

A rugged and diverse assortment of soldiers, the standard marine forces of the UNSC. These make up the bulk of the Human defenses. Originally a voluntary service to fight off enemies of the United Earth Government, as things went from bad to worse during the Covenant War every able person was conscripted into the forces, many as Marines.

They continue to wage a furious struggle against the Covenant, even as their numbers dwindle they do their best to protect Humanity - but they are only Human.

HIGH COMMAND

Based in Sydney, Australia, HighCom is the command of the UNSC and ONI. It controls all military and intelligence branches of Earth's forces, and all leaders of every major branch must report to HighCom. 

It's base, Bravo-6, or "The Hive" is located three kilometers under the surface of Sydney, and is protected by natural granite deposits, as well as solid Titanium-A alloy layers and EMP-hardened metal shielding.

NAVY 

Trained on a different path to the marines. The UNSC naval officers operate the main defense against the Covenant, the mighty UNSC Space Fleet.

Navy crews are made up of hundreds of men. Mechanics, Armory officers, Bridge Crews and the Captains and Admirals. All are responsible for maintaining and commanding the ship and its crew.

While the Marines fight the battle on the ground, the Navy must fight the much harder battle in space. Protecting the few planets still under human control.  

OFFICE OF NAVAL INTELLIGENCE (ONI)

The Office of Naval Intelligence is the core of the UNSC's secret projects. From the SPARTAN-II program, to the NOVA experiment, the doctors, engineers, and scientists of ONI have been at work trying to find an edge over the Covenant. ONI is split up into different groups, the most noteworthy being Section 3, the top-secret section which was the birthplace of the SPARTAN-II program. Section 2 is the "information control" branch of ONI; they control information that the public receives, they also "protect" the population from information they deem too damaging to morale. ONI and the UNSC are often at odds with each other, and their respective leaders are always at each other's throats. While ONI is preparing another secret project that can thwart the Covenant's advance, the UNSC are more likely to use brute force and weapons when it comes to fighting the Covenant. ONI has a successful history with it's projects, it's most successful being the SPARTAN-II super soldier.

ORBITAL DROP SHOCK TROOPERS

The Orbital Drop Shock Troopers are the Marines who make orbital insertions through planetary atmospheres. The 105th ODST Division is the toughest of the ODST Divisions.

The best of the best, the ODST's are an elite core of marines often known as "Helljumpers" due to the way they often enter battle. They use drop pods to enter combat zones from orbit and are often relied upon to capture ground for other UNSC forces. Therefore these soldiers are always in the most danger of being killed on a mission.

This method gave them the name "Helljumpers" due to the fact that the drop pods become insanely hot as they pass through the atmosphere and only the bravest, best and craziest would ever enter this group.

Still their efforts must be noted, and next to the SPARTANS they are the best in the military's ground forces.

PILOTS

Though most military personnel are trained to operate all UNSC vehicles none can equal pilots when it comes to Skyhawks, Pelicans and Longswords.

Trained to know their craft inside out, pilots can be relied upon to pick up and transport marines safely, make air strikes in combat zones and protect UNSC craft from Seraph and Banshee fighters.

SPARTANS

Click here for information regarding the Spartan Project.

HUMAN REBELS

Whilst not part of neither ONI or the UNSC it must be noted that there are still human rebels. There are those that fought against the UNSC before the Covenant, and they still exist today, thinking that they can hide from the Covenant. They are rouges, pirates and the general scum of humanity, or those who simply wish to hide. They use any weapon they can, and arm their ships to the teeth with weaponry, even civilian craft. They use anything they can get their hands on and sell for prophet or warfare. Some groups are more organized than others. Whilst some are no more than a common annoyance, others are huge groups making organized raids and attacks on UNSC turf. Though due to the risk of being found out by the Covenant this has decreased.

One such organized group had a secret base hidden in an asteroid field to escape ONI detection. The base was hidden within. It was later obliterated, along with all the people there by the Covenant.