40px-Terminal.png This article, UNSC Eternal Peacekeeper, was written by Pikapi. Please do not edit this fiction without the writer's permission.
UNSC Eternal Peacekeeper
Production information

Halcyon-class Cruiser


Reyes-McLees Shipyards

Modified by

Dr. Halsey, ONI

Technical specifications

1.17 kilometres (3,800 ft)


352 meters (1,150 ft)


414 meters (1,360 ft)

Engine unit(s)

Fusion drive

Slipspace Drive

Shaw-Fujikawa Translight Engine

Power plant
  • One primary fusion reactor
  • Two secondary fusion reactors

2 meters thick plating

Sensor systems
  • Radar
  • Spectroscopes
Targeting systems

Shipboard AI

Navigation system



Emergency thrusters (port/starboard)

  • Magnetic Accelerator Cannon (1)
  • Shiva-class Nuclear Missiles mounting 30 megaton HAVOK Nuclear Warheads (3)
  • Archer Missile Pods (300)
  • 50mm Point Defense Guns(40)
  • 300-400 Naval personnel
  • 2000 Marines: 1 ODST battalion, 1 Marine battalion
Cargo capacity
  • Longsword Interceptors (1 Squadron)
  • Sabre Starfighters (1 Squadron) (Supplied during the Fall of Reach, first used during the Loss of Hope)
  • Pelican Dropships (15)
  • Scorpion Tanks (8)
  • Rhinos (9+)
  • Scorpion Tanks (4)
  • Warthogs (16)
  • Gauss Warthogs (8)
  • Rocket Warthogs (4)
  • Troop Transport Warthog (2)
  • Mongooses (34)
  • Hornets (18)
  • Pelicans (12)
  • Albatross (12)
  • HEV (36)
  • Cryo-chambers (40)
  • Escape pods (42)
  • Lifepods (24)
Other systems

Two warship AI


Warship, special operations

Earliest sighting

Fall of Reach (2552)


Loss of Hope (2552)

Present for battles/events

United Nations Space Command

Known owner(s)
  • UNSC Navy
Known crewmembers
Known commander(s)

Captain Christopher Costello


The UNSC Eternal Peacekeeper (informally referred to as the Peacekeeper) was built alongside the UNSC Pillar of Autumn as it's sister ship, along with the UNSC Dawn Under Heaven. Both the Peacekeeper and the Autumn were prepared for deployment on August 30. However, before they could depart from the Epsilon Eridani System, they were recalled to Reach; the UNSC fleet was mustering in preparation for an imminent Covenant attack on the planet.

During the later half of the battle, numerous surviving Spartan-IIs and Spartan-IIIs, such as Riley-G311, Ryder-G231, Matthew-123, and Rowan-090, made their way to the vessel as escape from the horrific battle, with little anticipation for being ferried directly to another battle afterward. After the battle, while the Pillar of Autumn made a random slipspace jump to Installation 04, the Peacekeeper was ordered to follow the Covenant fleet by an unknown ONI Section Zero operative. This ultimately lead the Peacekeeper to Hope, where the ship deployed a small army of marines and Spartans, before sending out an emergency transmission requesting backup. Many UNSC ships rushed to it's aid, however, the Peacekeeper was destroyed by an overhead Covenant supercarrier before receiving help.