Jun

Jun is Noble Team's sniper, so he's not really that important. He ends up running away with the mastermind behind the Spartans and Cortana, Doctor Catherine Halsey. As he makes his farewell to his team, Carter can't even remember his name, simply calling him 'marksman'. Jun is therefore the only member of Noble Team bar Jorgey to survive, and is therefore the last Spartan-III in existance.