Fireteam Titan is a UNSC Fireteam that consists of 4 Spartan-IIIs. Spartan III John-B239 serves as their commander.
During the Fall of Reach, Spartan Fireteams were deployed to fend off the covenant invasion. One of them being Fireteam Titan. The team was formed when the UNSC needed a team for Special operations. 4 Spartans were chosen for the team.