Production information:
Manufacturer: UNSC

Technical specifications:
Engine unit(s): Deuterium nuclear fusion reactor

Slipspace Drive: Shaw-Fujikawa Translight Engine

Shielding: None

Hull: 60 centimetres (2 ft 0 in) Titanium-A battleplate

Length: 478 metres (1,568 ft 3 in)

Width: 151.9 metres (498 ft 4 in)

Height/depth: 112.3 metres (368 ft 5 in)

Armament:
■Magnetic Accelerator Cannon (1)
■Shiva Nuclear Warhead Missiles (1-3)[2]
■Archer missile pods (40) 30 missiles/pod
■Point Defense Gun (12)
■Twin Defensive Rail Gun Turrets (5)[3] (in some variants)

Complement: (Varies based on mission)
■Marines
■ODSTs
■Albatross dropships
■M312 Elephant HRVs
■M274 Ultra-Light All-Terrain Vehicles
■Pelican dropships
■D77-TC or D77H-TCI
■M808B Main Battle Tanks
■M12 Light Reconnaissance Vehicles
■M12G1 Light Anti-Armor Vehicle
■M831 Troop Transport
■AV-14 Attack VTOLs
■Single Occupant Exoatmospheric Insertion Vehicles
■Clarion Spy Drones (3)

Usage:
Role(s): Protection of larger fleet ships

Manufacturer: UNSC Navy
Name: Marathon
Class: Cruiser

Technical specifications:
Length 1,190 metres (3,900 ft)

Mass: 100,000 tons (200,000,000 lbs)

Engine unit(s): Deuterium Core Reactor

Slipspace Drive: Shaw-Fujikawa Translight Engine

Shielding: None

Hull: 191cm Titanium-A Battle Plate

Navigation system: AI or NAVCOM

Armament:
■2 Magnetic Accelerator Cannons
■Oversized Archer Missile pods(60 missiles each)
■50 mm Point Defense Guns
■5 Fusion Rockets

Complement:
■24 C709 Longsword-class interceptors
■Pelican dropships
■Marines
■ODSTs
■HEVs
■Warthogs
■Scorpions
■Hornets

Usage:
Role(s) Naval Engagement

Era(s) Human-Covenant war

lol you copied that from halopedia

Production information
Manufacturer Reyes-McLees Shipyards

Model Halcyon

Class Cruiser

Technical specifications
Length: 1,170 metres (3,800 ft)[1]

Width: 352 metres (1,150 ft)[1]

Height/depth: 414 metres (1,360 ft)

Engine unit(s): ■Primary fusion drives (2)
■Secondary fusion drives (4)

Slipspace Drive: Shaw-Fujikawa Translight Engine

Power plant: Mk. II Deuterium fusion reactors

Shielding: None

Hull: Resistant to around 5 Plasma Torpedoes/Titanium-A battle plate

Sensor systems
■Radar
■Spectroscopes

Navigation system: AI or NAV computer

Countermeasures: Emergency thrusters

Armament:
■Magnetic Accelerator Cannon (1)
■Shiva Missiles (4)
■Archer missile pods (6)
■50mm point defense guns (6)

Usage:
Role(s) ■Naval Engagements (combat)
■Troop Carrier/ Supply Carrier/ Escort

Era(s): Human-Covenant War

Affiliation: United Nations Space Command

UNSC Carrier

Production information:
Manufacturer: UNSC

Class: Carrier

Technical specifications:
Length: 3,000 metres (9,800 ft)

Width: 120 metres (393 ft 8 in)

Slipspace Drive: Shaw-Fujikawa Translight Engine

Shielding: None

Hull: 36 centimetres (14 in) of Titanium-A battle plate

Armament:
■Magnetic Accelerator Cannon
■300 Archer Missiles
■2 Fusion Rockets

Complement:
■C709 Longsword-class interceptors
■Shortsword-class bombers
■D77-TC Pelican-class dropships
■D77H-TCI Pelican-class dropships
■Marines
■Orbital Drop Shock Troopers
■Ground vehicles (presumed)

Crew: 2,100

Usage:
Role(s): Deployment of fighter ships and ground troops

Era(s): Insurrection
Human-Covenant War

Affiliation: United Nations Space Command