Truth

One of the first vessels assigned the Fleet of Particular Justice, Undiminished Entelechy and its sister-ship, Purity of Spirit, were surreptitiously ordered to conduct a close-range survey of the holy ring by the Prophet of Stewardship shortly after the arrival of the Pillar of Autumn. There it took aboard several great servant-machines of the ancient Forerunner gods, as well as a vast store of records harvested from the installation's outlying archives. Unfortunately, the ship was burned out of the sky by Thel 'Vadamee after it was boarded by Flood, to prevent the parasite's escape.

Regret

Its crew dead after crashing on Halo, the Undiminished Entelechy was quickly obscured by plant growth preternaturally accelerated by the ring's damage control system and environmental remediation protocols. More pressing dangers ensured that the broken ship - and the wonders it contained - would pass from UNSC and Covenant records and memory when the great installation was shattered. How details of the vessel passed into ONI hands for use in War Games recreations - and for what purpose Spartans are being tested in them - remains unknown.

Empire

Resentment of Earth's tightening grip on the colonies and excesses by the megacorporate council that served as Andesia's de-facto government led to an explosion of Insurrection activity in 2523 that reached even the protected facilities of AMG Transport Dynamics located in the capital, Noctus. Nearly a decade of bloody rebellion followed, until the threat of the Covenant finally aligned the interests of the Insurrectionists and UNSC in a common goal: survival.

Eden

Some question the wisdom of War Games simulations being set on the colony of Andesia, as anti-UEG tensions remain high on the colony even years after the end of the Covenant War. This constant threat of renewed Insurrectionist activity requires that Spartan operatives be constantly drilled for the eventuality that they will be called upon to secure strategic facilities in the colony during similar periods of chaos and unrest.

Pegasus

Unusual activity on an intact Halo demands thorough investigation. When strange structures appeared on Delta Halo's surface, ONI forwarded the basic layouts to Spartan teams for immediate familiarization and tactical exercises, with the expectation that they would soon be sent to the ring and deal with any Sentinel, Covenant, or Promethean forces that would prevent close scrutiny.

Orion

Though based on incomplete remote surveys, the Orion War Games simulation is a best-guess reconstruction of unusual Forerunner buildings that appeared seemingly overnight at key power and data junctions on Delta Halo; around which local Sentinel forces suddenly became actively hostile and organized.

Crossfire

War Games use a mix of props, holography, and simulated sensory information fed through a neural interface to create truly lifelike training environments. Though frowned upon by some UNSC leaders, the use of this system for inter-fireteam competition and off-duty entertainment has proven quite popular among Spartans.

Trench

The UNSC Infinity counts among its crew some of the most skilled War Games programmers in the fleet. Though kept busy creating environments for real-world combat ops or scientific simulation, a small cadre of designers and artists wheels-and-deals in favors to create custom spaces optimized and balanced for arena Slayer and Breakout fans.