Martian Congressional Republic Navy / MCRNLORE

Eros Incident
“Welcome to the future” — Spoilers for Leviathan Wakes follow.
When the Canterbury was destroyed, and James Holden released his broadcast incriminating the Martian Congressional Republic in its destruction, the MCRN Donnager picked up Holden and his crew of the Knight. During Holden’s debrief, the Donnager is attacked by six unidentified ships and is 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 Asteroid 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 most of their fleets in the system to return to Mars and declared war on United Nations (UN).

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

Ganymede Incident
“We are not alone” — Spoilers for Caliban’s War follow.
In the eighteen months since the Eros incident, the Martian Congressional Republic (MCR) and UN have been in a bitter cold war.

The Ganymede incident was an event in which a human-protomolecule hybrid attacked Martian Marines and UN Marines on Ganymede, killing everyone except Martian Marine Gunnery Sergeant Bobbie 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.

Slow Zone Incident
“Break on through” — Spoilers for Abaddon’s Gate follow.
The MCRN sends a joint expedition fleet to the Ring with the UNN and OPA navy. Following the MRCN Hammurabi’s pursuit of the Rocinante, The majority of the joint fleet enters the Sol Ring where the Slow Zone incident occurs.

Rebuilt fleet
“Enter a new frontier” — Spoilers for Cibola Burn follow.
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”.¹⁵

Defections and theft
“Catching fire” — Spoilers for Nemesis Games follow.
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 MCR 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 on board the fastest ship available, the Razorback.

Confusion and war
“Fires in the dark” — Spoilers for Babylon’s Ashes follow.
With an entire third of the MCRN fleet gone rogue, and heading towards the Laconia system, with no known reason the MCR was in a crisis that caused the Prime Minister to be deposed. During this time the remaining MCRN fleet was largely kept back and was unable to pursue offensive operations until all personal loyalty could be confirmed.

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

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

Post War
“An old enemy returns” — Spoilers for Persepolis Rising follow.
After the Free Navy Conflict the MCRN joined the UNN as a part of the Earth-Mars Coalition Navy (EMC) operating more as a single entity.

Defence of Sol
In the Laconia-Sol Conflict, the MCRN was part of the Earth-Mars Navy with the Transport Union attempting to stop the Laconian Empire’s venture to conquer the Sol system with its battlecruiser, the Heart of the Tempest. The EMC forces are eventually defeated at the Battle of Point Leuctra causing them to surrender.

Laconian Dominance
“The enemy is here” — Spoilers for Tiamat’s Wrath follow.
After the defeat to the Laconian Imperial Navy, the MCRN was integrated as part of the Laconian Empire. They were only allowed to operate individually while performing policing operations in the Sol system.