The Martian Congressional Republic Navy (MCRN) is the naval force of the Martian Congressional Republic, and the most important branch of its military.

It's smaller in size than the United Nations Navy, but more technologically advanced.

MCRN logo-onwhite-640x480


Most Martian ships are constructed in the same basic configuration, floor by floor from the drive cone and reactors. First is the engineering deck, then specialty compartments, then galley, followed by crew cabins. The next two decks are medical bays and interrogation chambers. The storage deck and airlocks follow, with the command deck and pilot (or the bridge in larger ships) at the “top”. Under thrust, Martian ships are essentially skyscrapers, with elevators and ladders connecting the various decks. MRCN ships generally cruise separately from one another, or in pairs for smaller ships. The third-generation Battleships are well armed enough to be considered fleets unto themselves. The pride of the MCRN is the Donnager-class dreadnought, named after the former flagship of the navy. Donnager dreadnoughts measure nearly 500 meters long, or the length of a 130-story office building, and bristle with torpedo tubes, point defense cannons, and massive railguns. They serve as flagships for MCRN fleets, and are large enough to carry smaller missile or escort frigates or escort within them.[1]

Second-generation battleships still have a place in the MCRN, serving alongside fast-attack cruisers, destroyers and frigates capable of patrolling the entire Sol system. Mars also has advanced stealth technology, though dreadnoughts and larger ships typically avoid this in favor of the intimidating effect of an aggressive battle posture. Larger ships are basically mobile bases, carrying marines and military interrogators aided by pharmaceuticals. By virtue of superior technology, fiercer armament, and better-trained crew, the battlefleets of Mars are unmatched. Martians never cease to remind others of this, and make their military pride known at any and every opportunity.[2]

Shipyards Edit

Shipyards Appears Notes
MCRN Callisto shipyards TV[3] and Books Destroyed by Free Navy asteroid strike.
Mariner Valley shipyard TV

Fleets Edit

The Martian Congressional Republic Navy is divided into three main fleets. Additional fleets operate as a part of the main ones:

Fleets Appears Notes
MCRN Home fleet Books and TV Stationed at Mars.
MCRN Saturn fleet TV lore
MCRN Jupiter fleet Books and TV Stationed at Jupiter and its moons including Ganymede.
MCRN 3rd fleet TV Lost four battle groups during combat in the UN-MCR War.

Known ships/Platforms Edit

Designation Class Ship type Appears Notes
X5 MCRN Stealth C Ballistic Missile Platform First Strike Nuclear Missile Platform Mobile Missile Platform Season 3 (TV) Whilst tracking Earth all 5 were destroyed by the United Nations.
MCRN Donnager Donnager-class Battleship Leviathan Wakes (Books)
Season 1 (TV)
Scuttled after it was damaged by stealth ships and boarded, all while investigating the Scopuli distress call and Canterbury destruction.
MCRN Harman Dae-Jung Caliban's War(Books)
(TV lore)
Assigned to MCRN Home fleet
MCRN Icaria Planum (TV lore) Became flagship after the destruction of the Donnager.
MCRN Bellaire (Books) and (TV lore)
MCRN Barkeith (Books) and (TV lore) Stolen from the MCRN by Admiral Duarte's Laconian faction before being destroyed by a Ring Gate anomaly.
MCRN Schiaparelli (TV lore) Current Flagship of MCRN Jupiter fleet after UN-MCR War
MCRN Hotspur Season 2 (TV) Assigned to MCRN Jupiter fleet, Ganymede border Patrol
MCRN Firebrand (TV lore) Assigned to MCRN Jupiter fleet, Callisto shipyard defense
Carcassonne Tiamat's Wrath (Books) Mothballed then later dismantled and rebuilt for the underground
Armstrong Tiamat's Wrath (Books) Mothballed then later dismantled and rebuilt for the underground
Bellerophon Tiamat's Wrath (Books) Mothballed then later dismantled and rebuilt for the underground
MCRN Cydonia Raptor-class Fast-attack cruiser Caliban's War(Books)
MCRN Valkyrie Scirocco-class Assault cruiser Season 2 (TV) Launched a torpedo at the Weeping Somnambulist.[4]
MCRN Scirocco S2 S3 (TV) Destroyed Phoebe Station to prevent earth reaching it. Later damaged during the Ganymede Incident.
MCRN Xuesen Season 3 (TV) Sent to the Ring. Bobbie Draper is on board.
MCRN Hammurabi(TV)

MCRN Hammurabi(Books)
Scirocco-class Assault cruiser Season 3 (TV) Part of the MCRN Jupiter Fleet headed by Capt. Sandrine Kirino. Witnesses infighting of the UNN Jupiter Fleet after attempted mutiny aboard the UNN Agatha King.
Unknown class Frigate Abaddon's Gate (Books) One of the first ships to enter the Slow Zone
MCRN Aryabhata Scirocco-class(presumed)[5] Assault Cruiser Season 4 (TV) Stolen uniforms of this ship were worn by Belters to enter restricted MCRN facilities.
MCRN Cavalier Unknown class Frigate Abaddon's Gate Present during the Slow zone incident
MCRN Morrigan Morrigan-class Patrol destroyer (TV lore) Stationed at Titan
MCRN Scipio Africanus Season 1 (TV)
Leviathan Wakes (Books)
High profile incident in media involving rock-throwing attack, in "Rock Bottom".[Citation needed] TV version probably survived. Book version not attacked.
MCRN Kittur Chennamma Season 3 (TV) During the UN-MCR War, the ship was hit by railgun rounds completely destroying its command deck and taking out its water and life support systems. Would later be found by the Rocinante which salvaged its munitions.
MCRN Shandian Season 2 (TV) Modified for Stealth. Shadowed the UNS Arboghast over Venus until disappearance whilst entering the atmosphere.
MCRN Damascus (TV lore) Part of Operation Silent Wall.
MCRN Iceni (TV lore)
MCRN Avalanche (TV lore)
MCRN Hamill-Stewart (TV lore)
MCRN Ambedkar Season 1 (TV) Attempted to Board the Rocinante until receiving MCRN Black Ops code.
MCRN Sally Ride Unknown class Destroyer Caliban's War(Books)
MCRN Iani Chaos Unknown class Destroyer Caliban's War (Books) Present during Io Campaign.
MCRN Cavalier Unknown class Frigate (Books)
MCRN Tachi /
Corvette-class Light frigate[6] (TV)
Believed to be destroyed, but actually came under the control of the Canterbury crew survivors and recommissioned as Rocinante by the crew themselves.
MCRN McCabe (TV lore) Part of Operation Silent Wall
MCRN Valenza (TV lore)
MCRN Karakum Season 2 (TV) Black Ops ship destroyed by United Nations Navy over Ganymede.[7]
Pella (Books) Stolen from the MCRN for the Free Navy. Later destroyed by Ring-Gate anomaly.
Connaught (Books) Stolen from MCRN for the Free Navy. Later when crew defected the ship fought alongside the Consolidated Fleet against the Free Navy. Eventually heavily damaged in battle.
MCRN Tsuchi Corvette-class (Presumed) Light frigate (Books) Decommissioned after Io Campaign yet reappeared a year later near Europa.
Shinakuto (Books) Stolen from the MCRN for the Free Navy.
Andreas Hofer (Books)
Koto (Books)
Solano (Books)
Panshin (Books)
Serrio Mal (Books)
Witch of Endor (Books)
Ando (Books)
Dagny Taggart (Books)
MCRN Bandon Unknown class Unknown ship type (Books) Alex Kamal served on the Bandon when he was with the MCRN.
MCRN Africanus Unknown class Unknown ship type (TV) Stationed at Callisto.
MCRN Askia Unknown class Unknown ship type (TV) C.O. Captain Lucas was onboard Xuesen during the Slow Zone Incident.
MCRN Yangtse Unknown class Unknown ship type (TV) Launched Ambedkar to Board the Rocinante for inspection.
MCRN Carson Lei Unknown class Unknown ship type (Books) Destroyed by Free Navy during the raid on Callisto shipyards.
MCRN R R Martin Unknown class Unknown ship type (TV) Present at Io Campaign.
MCRN Apalala Unknown-class Supply ship (Books) Stolen from the MCRN before Free Navy Conflict.
Abraham Unknown-class Unknown ship type Season 4 Passed through abandoned iron-nickel mine
Abaddon Unknown-class Unknown ship type Season 4 Passed through abandoned iron-nickel mine
Bradbury Unknown-class Unknwon ship type Season 4 Passed through abandoned iron-nickel mine
Wong Unknown-class Unknown ship type Season 4 Passed through abandoned iron-nickel mine
Persepolis Unknown-class Unknown ship type Season 4 Passed through abandoned iron-nickel mine

Ship-classes in serviceEdit

Class Ship type Appearances Photo Notes
Donnager-class Battleship (TV)
Donnager Render 1 The largest and most powerful ship-class in the MCRN fleet
Scirocco-class Assault cruiser (TV) Sciroccoclassconceptart Used to deploy Force Recon Marines via externally docked Chariot-type dropships.
Raptor-class Fast-attack-cruiser (Books) Considered Top-of-the-line during the UN-MCR War
Corvette-class Light frigate (TV)
Morrigan-class Patrol Destroyer (TV) Morriganclassdestroyer1 Heavily used in policing operations


Eros IncidentEdit

When the Canterbury was destroyed, and James Holden released his broadcast incriminating Mars in its destruction, MCRN Donnager picked up Holden and his crew of Knight. During Holden's debrief, the Donnager is attacked by six unidentified ships and eventually destroyed. Holden and his crew escaped on the MCRN Corvette-class ship Tachi and later claim it as salvage.

When the Donnager is destroyed by what is believed to be OPA ships, Mars declares war on the Belt. Later, when Holden releases information that the ships that destroyed the Donnager were actually made on Earth, United Nations Navy ships fire on MCRN ships in Mars orbit, also destroying the Deimos deep radar station. The MCRN then ordered their ships in the system to return to Mars and declared war on Earth.

After the protomolecule was unleashed on Eros during the Eros incident, and its existence became known to the public, the Martian fleet nuked Phoebe into a thin gas that was sucked into Saturn’s gravity.

Ganymede IncidentEdit

In the eighteen months since the Eros incident, the MCR and UN have been in a bitter cold war.

The Ganymede incident was an event in which a human-protomolecule hybrid attacked Martian and UN Marines on Ganymede, killing everyone except Gunnery Sergeant Roberta Draper. The initial attack was misinterpreted by both the MCR and the UN as an attack from the other side, which led to a battle above and on Ganymede that claimed nearly three thousand military and civilian lives, as well as causing over five billion MCR dollars of infrastructural damage.

Rebuilt fleetEdit

By the time of the Conflict on Ilus IV, the MCRN had recovered significantly from its fighting with the UN in the war. The navy had sixteen battlecruisers and fifteen thousand nuclear warheads, alongside "high energy proton cannons".[8]

Defections and theftEdit

Knowing that the MCR was facing an economic crisis due to mass emigration to new systems MCRN Admiral Winston Duarte organized to form a new government in the Laconia system using radical Belters as cover to escape the system with a third of the entire MCRN fleet. This was done by stealing officially decommissioned ships including many Corvette-class ships and giving them to the Free Navy to start a war.

Unknown to the Majority of the MCRN and the Martian Congressional Republic government when the Free Navy Conflict began Free Navy ships were able to approach the ship carrying the Prime Minister Nathan Smith posing as reinforcements. These ships then attacked the fleet at close range catching the MCRN off guard and forcing them to send the Prime Minister off onboard the fastest ship available the Razorback.

Confusion and warEdit

With an entire third of the MCRN fleet gone rogue and heading towards the Laconia system with no known reason the MCR was in crisis that caused the Prime Minister to be deposed. During this time the remaining MCRN fleet was largely kept back and was unable to purse offensive operations until all personels loyalty could be confirmed.

Despite this at least one MCRN ship carrying Martian Marines was able to join the Ceres Offensive led by the United Nations Navy and arrived as one of the first two ships (the other carrying UN Marines) to easily retake Ceres.

The remaining MCRN forces once reorganised and secured were able to join the Consolidated Fleet Offensive including most of the reserves protecting Mars.

Post WarEdit

After the Free Navy Conflict the MCRN joined the United Nations Navy as a part of the Earth-Mars Coalition Navy operating more as a single entity.

Laconian DominanceEdit

After the defeat to the Laconian Imperial Navy the MCRN was still permitted to operate as part of the Earth-Mars Coalition Navy in policing operations in the Sol system.

Eros IncidentEdit

Ganymede IncidentEdit



  1. The Expanse Roleplaying Game, chapter 9 - Mars
  2. The Expanse Roleplaying Game, chapter 9 - Mars
  3. The Expanse TV series: Season 3, episode 5 - Referenced in dialogue.
  4. The Expanse TV series: Season 2, Episode 12 - The Monster and the Rocket
  5. Based on ship code seen on back of crew uniform matching that of Scirocco-class ships "EML-"
  6. Spacedock Donnager-class video
  7. The Expanse TV series: Season 2, Episode 12 - The Monster and the Rocket
  8. The Expanse Novel: Cibola Burn, Epilogue, Avasarala
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