Constellis Group are the system's largest private military contractor. Their headquarters are in Washington, D.C., and they own and run White Sands Missile Range in New Mexico, the Panopticon Relay in Geostationary Orbit, and Gateway Station Alpha in Near-rectilinear Halo Orbit.
Constellis were contracted to escort supply ships constructing Fort Liberty at EM1 during the outbreak of hostilities. When the USNS Herrick came under fire from a privateer the two Constellis escort corvettes CS Drake and CS Thor returned fire, crippling the ship and killing its crew. Constellis's largest ship was the newly purchased CS Justice, of similar size to a post-war cruiser although lacking longer range missiles. The Justice was already in a low-energy lunar transfer orbit and began a series of burns to join the Cruiser USS Unity, which was adjusting its orbit to intercept Tianmen Station. The destruction of the Unity by the Russian missile carrier MRK Mirazh and the commercial PRC drone cargo ship Tianzhou escalated the proxy war into a hot conflict and left the Justice isolated and outnumbered with no nearby support.
Long range fast drones from the Tianzhou were launched to intercept the Justice as it was adjusting for a transfer back to Earth, while the slower Mirazh started burning in pursuit. The Justice was able to shoot down several drones with barrier missiles, however one drone was able to jink past its missile and launch a volley of self propelled explosives before it was shot down by CIWS. Most of the explosives were also shot down, however parts of the hull and some external antennas were destroyed. The Drake and the Thor were able to intercept a few hours later, and the Mirazh slowed its burn and stalked the three ships for another day as they moved towards Earth. During this time no other ships from either side were able to reach the combatants until the first US fleet came into range and forced the Mirzah to break away.