UN clashes with dissident political movements, the most important of which were the "Koslovics" and the "Frieden," began the crisis that led to the formation of the UNSC. The Frieden movement was a fascist organization based on the Jovian Moons, a group that received backing from some corporations operating in the Federal Republic of Germany on Earth. Their ideological opponents, the Koslovics, formed a Marxist–Leninist group centered around the leadership of Vladimir Koslov around the same time.
The UNSC was commissioned in 2163 as a military force primarily composed of Naval and Marine forces. In July 2164, the UNSC partook in its first battle. From this point, the UNSC was used by the UN in conflicts, including the Interplanetary War.
With the conflicts of Sol over, a newly powerful Unified Earth Government and UNSC began to expand into the stars. At about 2490, the planet of Reach would become extremely important to the UNSC. It would become a major naval yard and training center.
The apex of human expansion would come in 2490, when more than 800 worlds were considered part of the UEG's territory, many developing into full-fledged colonies. By this time, a ring of Outer colonies was providing the UEG with the raw materials that made the macro-economy function; with the political power remaining with the Inner colonies. The massive difference in wealth distribution and political power, which became a hallmark of humanity by this period, led to new threats of secession from the outer ring.
Winds of Insurrection
In 2492, the colony of Far Isle was razed by nuclear weapons after a massive uprising, creating a new found reason to rebel. The Callisto Incident in 2494 would begin a bloody struggle against groups of terrorists (or freedom fighters), who wanted independence. The UNSC battled them for nearly three decades. As the situation deteriorated, the UNSC created the SPARTAN-II Program, which was headed by one Catherine Halsey.
The Human-Covenant War
In 2525 a CMA battlegroup had been decimated. Upon investigation from the only surviving ship, the CMA Heracles it had been discovered that humanity was not alone. The planet the battlegroup was at, Harvest, was completely destroyed. The UNSC was placed on high alert. On November 1st, the UNSC stripped away the Colonial Military Administration and gave its forces to NAVCOM and UNICOM.
Decades of War
The beginning phase of the war was marked by disastrous defeats, and even more costly victories. Aside from the Second Battle of Harvest in 2526, where a large force led by Vice Admiral Preston Cole barely defeated a smaller Covenant fleet, the UNSC's influence on their territories quickly dwindled in the course of their struggle. In the span of a few years, the Covenant had managed to capture and destroy the majority, if not all of the Outer Colonies, and a small portion of the Inner colonies.
The Final Year
By 2552, the UNSC, though heavily outnumbered and outgunned, had nonetheless slowed the Covenant's inexorable progress through human space. However, the overall situation remained dire. In desperation, HIGHCOM ordered a high-risk operation. Spartan-II super soldiers were to insert into Covenant space, with a captured Covenant vessel, capture a high-ranking Prophet, and return to UNSC space in an attempt to ransom their own leader for a truce. Before the operation began, the Covenant found and destroyed the fortress world Reach, killing a large portion of the UNSCDF, and rendering most of the Spartans that were to execute the mission KIA or MIA. The Covenant endured heavy losses, both in space and on the planet's surface. However, the largest and most important military world protecting the Sol system had fallen silent. Little hope of continued, successful resistance remained.
On March 3, 2553, the Human-Covenant war officially ended in victory for the UNSC and the Covenant Separatists, but at a staggering price. An estimated twenty-three billion human civilians and military personnel were killed between 2525 and 2553. Most of the UNSC's major military outposts were destroyed, with the exception of Earth which sustained heavy damage. With the defeat of the Covenant though, the UNSC now had a second chance to rebuild, and thrive.
Following the inauguration of Dr. Ruth Charet in January 2553, the UNSC handed back its emergency powers to the UEG on January 8 of that year. The UNSC also maintained its earlier truce with the members of the Covenant Separatists initiated by Lord Hood and the Arbiter. Nevertheless, a black-ops team from the Office of Naval Intelligence that had been supplying arms to a Sangheili faction, one ideologically opposed to the Arbiter, to destabilize their government rendering them incapable of threatening Earth.
The end of the war also returned brought colonial politics back into focus. Many colonies sought to work with the UNSC to help safeguard their homes. However, a number of worlds turned openly hostile to the UNSC and seeking to distance themselves from the UNSC and UEG. Despite this, the UNSC didn't actively respond to most of this. Only if these worlds attempted to violently secede did the UNSC get involved.
As of 2558 Jul 'Mdama's Covenant was actively opposed against the UNSC. The threat would be finally be contained after Jul 'Mdama's assassination at Kamchatka and a final battle at Sunaion. Though this would be overshadowed by the sudden onslaught of the Created, near the end of the year.
Halo is a military science fiction first-person shooter video game franchise managed and developed by 343 Industries, a subsidiary of Xbox Game Studios. Halo was originally developed by Bungie Studios. The series centers on an interstellar war between humanity and an alliance of aliens known as the Covenant.
The games in the series are critically acclaimed, with the original considered the Xbox's "killer app".