9th Marine Expeditionary Force

The 9th Marine Expeditionary Force was a UNSC Marine Corps unit consisting of veteran Marines that was one of many units serving in the Epsilon Eridanus System. This unit was a critical part of the UNSC's fight in the Insurrection. These men got attacked by Covenant forces on Epsilon Eridanus when they first landed but ended up winning the battle with minor casualties.

Elements

 * 21st Marine Division
 * 1st Battalion