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Epsilon Omega is the codename of the only SPARTAN-III in Epsilon Company, and the last SPARTAN-III to be trained before the start of the SPARTAN-IV program.

Early life
Born in 2546 on Reach to unknown parents, Epsilon Omega developed an independent streak starting from the day he learned to walk. At age five, his parents were killed in a horrific accident, leaving Epsilon, an only child, to fend for himself. ONI found him on the streets shortly before his sixth birthday and conscripted him into the SPARTAN-III Epsilon Company.

Conscription and Training
With the advent of the SPARTAN-IV Program, Epsilon Company's funding was almost completely withdrawn. However, there was enough money to train one child and augment him with three times the usual amount of SPARTAN-III drugs. They pushed Epsilon far past the breaking point of normal humans, but thanks to his surprising resilience he surpassed every obstacle in front of him.

Augmentations and Effects
In 2558, Epsilon received his augmentations. He became stronger and faster than many of the other SPARTANs, and he was also found to be an expert with almost any type of weapon. However, he became moody, angry, and resentful, hating ONI for what they did to him and the UNSC for allowing it to happen.