The Rubble Defense Force was a body of citizens and Insurrectionists that performed military duties across the habitats in the Rubble. Most of the Defense Force had little experience and they were essentially a militia for the Rubble. The defense force keeps a weapons cache in Habitat Greenworthy. During the evacuation to Habitat Exodus, the Rubble Defense Force was called to arms, mustering an unknown number of people. They succeeded in pinning down the Unggoy on the Rubble.