Leon Sikowsky

Chief Petty Officer Leon Sikowsky was a UNSC Army trooper who fought in the final years of the. Shortly after the war's conclusion, Sikowsky was selected to become a SPARTAN-IV supersoldier. He was transferred to the Navy, and was soon transferred again, along with the other active SPARTAN supersoldiers, to a new branch of the UNSC military known simply as "Spartan".

Sikowsky is known to have been stationed aboard the.