The Martian Congressional Republic Navy (MCRN) is the naval force of the Martian Congressional Republic, and the most important branch of its military.
The Martian Congressional Republic Navy is divided into two fleets:
|Home Fleet||Stationed at Mars.|
|Jupiter Fleet||Stationed at Jupiter and its moons including Ganymede.|
Known ships Edit
|MCRN Donnager||Donnager-class||Dreadnought/Battleship||TV and Books||Scuttled after stealth ships damaged it and it was boarded while investigating Scopuli distress call and Canterbury destruction.|
|MCRN Harman Dae-Jung||Donnager-class||Dreadnought/Battleship||Books|
|MCRN Bandon||Donnager-class (or other large military vessel)||Dreadnought/Battleship||Books||Alex Kamal served on the Bandon when he was with the MCRN.|
|MCRN Barkeith||Donnager-class||Dreadnought/Battleship||Books||Stolen from the MCRN by Admiral Duarte's Laconian faction before being destroyed by a Ring Gate anomaly.|
|MCRN Cydonia||Raptor-class||Fast-attack cruiser||Books|
|MCRN Sally Ride||Unknown class of destroyer||Destroyer||Books|
|MCRN Scipio Africanus||Unknown class of destroyer||Patrol destroyer||TV and Books||High profile incident in media involving rock-throwing attack, in "Rock Bottom".[Citation needed] TV version probably survived. Book version not attacked.|
|MCRN Shandian||Unknown class of destroyer||Stealth destoyer||TV||Shadowed the UNS Arboghast over Venus until disappearance whilst entering the atmosphere.|
|MCRN Yangtse||Unknown class||Unknown ship type||TV||Attempted to Board the Rocinante until receiving MCRN Black Ops code.|
|MCRN Scirocco||Unknown class||Unknown ship type||TV||Destroyed Phoebe Station to prevent earth reaching it.|
|MCRN Morrigan||Unknown class||Unknown ship type||TV||Stationed at Titan|
|MCRN Africanus||Unknown class||Unknown ship type||TV||Stationed at Callisto|
|MCRN Lucian||Unknown class of frigate||Frigate||Books|
|MCRN Cavalier||Unknown class of frigate||Frigate||Books|
|MCRN Hammurabi||Unknown class of frigate||Frigate||Books|
|MCRN Tachi||MCRN Corvette Class||Corvette||TV and Books||Believed to be destroyed, but actually came under the control of the Canterbury crew survivors and recommissioned as Rocinante by the crew themselves.|
|MCRN Tsuchi||MCRN Corvette Class||Corvette||Books|
|MCRN Karakum||MCRN Corvette Class||Corvette||TV||Black Ops ship destroyed by United Nations Navy over Ganymede.|
|Pella||MCRN Corvette Class||Corvette||Books||Stolen from the MCRN for the Free Navy. Later destroyed by Ring-Gate anomaly|
|Connaught||MCRN Corvette Class||Corvette||Books||Stolen from MCRN for the Free Navy. Later when crew defected the ship fought alongside the Combined Fleet against the Free Navy. Eventually heavily damaged in battle.|
|Shinsakuto||MCRN Corvette Class (presumed)||Corvette (presumed)||Books||Stolen from the MCRN for the Free Navy.|
|Koto||MCRN Corvette Class (presumed)||Corvette (presumed)||Books||Stolen from the MCRN for the Free Navy.|
|Solano||MCRN Corvette Class (presumed)||Corvette (presumed)||Books||Stolen from the MCRN for the Free Navy.|
|Panshin||MCRN Corvette Class (presumed)||Corvette (presumed)||Books||Stolen from the MCRN for the Free Navy.|
|Serrio Mal||MCRN Corvette Class (presumed)||Corvette (presumed)||Books||Stolen from the MCRN for the Free Navy.|
|Witch of Endor||MCRN Corvette Class (presumed)||Corvette (presumed)||Books||Stolen from the MCRN for the Free Navy.|
|MCRN Valkyrie||Unknown class||Unknown ship type||TV||Launched a torpedo at the Weeping Somnambulist.|
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 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.
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.