The super secret super soldier program rebuilt him after the incident at shawshank. Thawed after years of cryogenic preservation, he was drafted into service aboard the enterprise. After a misunderstanding that involved Captain Kirk and a non lubricated dildo, he was arrested and stripped of his rank.
Rumor has it that he was subsequently spared the death penalty by choosing to serve in the Colonial Marine Corp under a pseudonym. Protecting colonists from their own virginity and hunting bugs across the @$$hole of the universe.