Ahmet-B198, also know as Codename: APOLLO, was a Spartan-III Commando of Beta Company along with his younger twin brother Iskender-B199 during the Human-Covenant War. After losing their parents during the Battle of New Constantinople, the twins volunteered for the Spartan-III Program. Ahmet and Iskender, proved to be a highly lethal duo above and beyond their fellow Spartan-III's and the two were eventually removed from the main company to be part of the secretive Headhunters unit. The two's close bond as twins made their matching rate a astounding 98.1%, the highest in the Headhunter Program.