Colonial Terraforming Organization

The Colonial Terrraforming Organization, often abbreviated as CTO, is an organization that was originally formed to try and restore salvageable colonies such as Reach, Harvest, and Arcadia from the Covenant devastation through extensive terraforming procedures. However, some colonies are unable to be restored due to their atmosphere being destroyed by Covenant glassing.

Colonies Restored
These colonies have finished their restoration, though as much as 20% of the glassed surface may still remain. By the end of the 26th century, 80% of all possible colonies had been restored.


 * Africa, Earth - Restored 2563
 * Reach - Restored 2567
 * Harvest - Restored 2577
 * Arcadia - Restored 2577