Robert-025

Like the other SPARTAN-IIs, Robert-025 was abducted at age six and conscripted into the SPARTAN-II program in 2517. He later survived the augmentation procedures in 2525. Along with Leon-011 and August-099, Robert formed the Spartan-II fast reaction unit Omega Team, which was created primarily for asset denial operations.

Omega Team is typically deployed with the goal of breaking the enemy's hold long enough in order to reinforce local defenses and buy time for a UNSC response. During the Human-Covenant War, Omega Team was deployed to several colony worlds threatened by the Covenant, assisting in emergency evacuation efforts and enacting classified last-stand protocols. The team proved highly proficient at the denial of critical resources, data, and even personnel to the Covenant by any means necessary, which sometimes required the deployment of weapons of mass destruction.

At some point in 2527, Omega Team may have been deployed against Insurrectionist forces in an operation on Hellas against insurgent forces employing the use of Rumbledrugs. However, it is possible that Omega Team was merely briefed on this operation rather than actively assigned to it.

On several occasions, Omega Team worked closely with Jerome-092, Alice-130, and Douglas-042 of Red Team, including during the defense of Arcadia when it was attacked in 2531. During the battle, they were separated when the UNSC Spirit of Fire departed the system to chase retreating Covenant forces.During the Arcadia Campaign, Robert worked alongside Leon-011, August-099, Kai-125, Riz-028, and Vannak-134, before the latter three were split off to form an independent Silver Team. In 2540, the full six-member roster of Omega was temporarily reformed and deployed to an unknown operation on Hellas.

In the late stages of the Human-Covenant War, or the earliest years of the post-war era, Omega Team was involved in the testing of numerous "Breach" development iterations on the MJOLNIR Mark VI platform. These field tests were successful, and saw improvements folded into later GEN2 and GEN3 productions.

Decades after Red Team's last encounter with them, Commander Jerome-092 discerned that Omega Team had survived the war based on UNSC records recovered from the Henry Lamb Research Outpost. In 2560, the team was deployed to Arcadia once again, this time with goal of observing a deal between Adam Andrews—the CEO of Optican—and Kig-Yar working for Nor Fel. After a successful handoff between the two parties amid Forerunner ruins, August eliminated a trio of Kig-Yar with her M99A2S3 Stanchion, the signal for Robert-025 and Leon-011 to move. While Leon rushed for the Kig-Yar's Phantom, Robert positioned himself to neutralize any escapees from the craft with his machine gun turret. Once Leon confirmed the dropship was clear, Robert got to work securing the Kig-Yar's would-be prize: the focus cannon of a R'awuw-pattern Scarab. After performing some scans of the weapon, Robert secured it for transport as Leon confirmed that the aliens had delivered a shipment of rumbledrugs to Andrews. With their objective complete, Omega Team left the area.

Circa the end of the Human-Covenant War, Robert-025 participated in field tests while wearing MJOLNIR Mark VI with the Breach Link helmet attachments, UA/KOTIN chest armor, and TAC/SRV-III shoulder armor. As of 2560, he wears Mark IV MJOLNIR armor with a Paladin-class helmet incorporating the Project GOSWHIT attachment. He also wears IMA/BARTIZAN left shoulder, an TAC/GARITA/OMEGA right shoulder (consisting of a standard Mark IV Garita pauldron with a combat knife), and an UA/NERA-ATS chestpiece. Robert's left forearm includes the TAC/FIRMBLUR attachment while his kneepads are the IMA/SASP-III variant. He sports a UTIL/DAS-M BLOCK 20 attached to his left leg. During this time, Robert was known to wield a machine gun turret in combat.

The MA5C Individual Combat Weapon System, abbreviated MA5C ICWS and commonly known as the MA5C assault rifle, is a standard-issue service rifle for the UNSC Marine Corps and the Navy.

The M7/Caseless Submachine Gun (M7/SMG) is a personal defense weapon developed and manufactured by Misriah Armory.

The M90 Close Assault Weapon System (CAWS), also known as the M90 Close Assault Shotgun, M90 assault shotgun, or simply the M90, is a pump-action shotgun in service with UNSC.

The United Nations Space Command (UNSC) is the military, exploratory, and scientific agency of the Unified Earth Government (UEG) and has acted as the emergency governing body of the human race.

The Sangheili, or "Elites" as they are known by humans, served as the military leaders of the Covenant. The Sangheili are the only race within the Covenant permitted to build and command starships within the Covenant, though the crews are always composed of a mix of races. The Jiralhanae, or "Brutes" as they are known by humans, were the most recent addition to the Covenant, and served as soldiers and bodyguards within the Covenant military. The Lekgolo are a race of worm-like creatures that can combine to form large, intelligent assemblages called Mgalekgolo, known by humans as "Hunters". Clad in nearly impenetrable armor and armed with their trademark Assault Cannon, they served as the Covenant's heaviest ground troops. Hailing from Balaho, the Unggoy, or "Grunts" as they are known by humans, were the most common and low-ranking caste of the Covenant. They breathe methane gas, and thus must wear a large tank on their back full of methane to survive on other planets. The Kig-Yar, or "Jackals" or "Skirmishers" as they are known by humans, were the scouts and marksmen of the Covenant military due to their superior senses.

The M12 Light Reconnaissance Vehicle (LRV), colloquially referred to as the Chaingun Warthog or simply Warthog, is one of many weaponized configurations of the UNSC's ubiquitous Warthog platform. Models fielded during the Insurrection and the Human-Covenant War featured a turret-mounted M41 Vulcan or M46 Vulcan, while some more modern post-war variants are armed with an M343A2 chaingun.

The Human-Covenant War was instigated by the High Prophets of the Covenant following a discovery which led them to believe that humans were directly related to the Forerunners, contradicting their ancient religion. Seeking to keep various political and religious orders intact, the High Prophets declared a holy war of genocide against the human species, and the discovery of their relation to the Forerunners was kept a secret. With superior firepower, numbers and technology, the Covenant would repeatedly overpower the UNSC across hundreds of human-inhabited worlds, including the heavily defended strongholds of Reach and Earth. Humanity would win only scattered and costly victories.