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The Earth-Mars Coalition Navy (EMC), is the joint naval task force of Earth (the United Nations Navy) and Mars (the Martian Congressional Republic Navy). It has policed the Sol system together for almost a century. According to Dimitri Havelock, the EMCN has about a hundred gunships at its disposal at the time the Eros incident took place.[1]


Eros IncidentEdit

Since the events of Leviathan Wakes, Earth and Mars have been in a state of war, sometimes hot, sometimes cold; as such, EMCN forces are now divided into the UN Navy and the MCRN. (The exception to this division is any action involving the Belt or Outer Planets - the Inner Planets cannot afford to look weak to the Outer Planets Alliance.)

Ganymede IncidentEdit

In the eighteen months since the events of the Eros incident the EMCN has effectively disbanded with its two members entering into the UN-MCR War.[citation needed]

Post-Free Navy ConflictEdit

Some time after the Free Navy Conflict, the UN and the MCR governments re-established the Earth-Mars Coalition.

Laconia-Sol ConflictEdit

When the Heart of the Tempest moved towards the inner planets the 2nd Fleet engaged the battleship. After taking heavy losses the surviving ships made high-g burns to escape the battle area. Vital data was gained of the Laconian ships weapons and defenses during this engagement that would be studied and put to use in the next battle.

The Main EMC fleet consisting of every ship that could be armed awaited the Heart of the Tempest at Point Leuctra. The entire fleet engaged the Laconian battleship along with their Transport Union allies. After heavy losses the Governor Knight fired high-yield nuclear missiles against the enemy ship. After detonation it was assumed the Tempest would have been destroyed, yet the battleship survived and was still firing missiles. Multiple surviving ships burned at suicide runs in attempts to ram the Tempest. All the admirals in the fleet were killed and the surviving ships surrendered effectively ending the Earth-Mars Coalition as the Laconian Empire took over control of the Sol system.

Under Laconian ruleEdit

Under Laconian rule the Earth-Mars coalition navy was still kept in use as a policing force in the Sol system. Despite the technological superiority of the Laconian Imperial Navy it lacked the ship numbers so the EMC found a purpose.

The EMC was by this time firmly under control of the Laconian Empire and its fleets commanded by Laconian flag officers whom reported directly to Admiral Trejo onboard the Heart of the Tempest[2].


Designation Appears Notes
1st fleet Persepolis Rising (Books) First EMC fleet to engage Heart of the Tempest
2nd fleet Persepolis Rising (Books) Gathered near Jupiter before Battle of Point Leuctra.

Known ships Edit

Designation Class Ship type Appears Notes
EMC Frederick Lewis Unknown-class Battleship Persepolis Rising (Books) Crippled by Heart of the Tempest
EMC Governor Knight Unknown-class Unknown Persepolis Rising (Books) Launched high-yield nuclear torpedoes at Heart of the Tempest
EMC Arcadia Rose Unknown-class Unknown Persepolis Rising (Books)
EMC Talwar Unknown-class Unknown Persepolis Rising (Books)
EMC Severin Unknown-class Unknown Persepolis Rising (Books)
EMC Ontario Unknown-class Unknown Persepolis Rising (Books) Destroyed by Heart of the Tempest
EMC Odachi Unknown-class Unknown Persepolis Rising (Books)
EMC Michael Souther Unknown-class Unknown Persepolis Rising (Books)


  1. The Expanse Novel: Leviathan Wakes , Chapter 8
  2. The Expanse Novel: Tiamat's Wrath, chapter 12 - Bobbie