Fireteam (gameplay mechanic)

Fireteam is a gameplay mechanic found in Halo: Reach. With it, the player can recruit up to five UNSC Army, Militia, Marine, Air Force pilots, and ODST troopers found through the campaign. These troopers will then follow the player throughout the level, and their status is shown in the player's HUD next to the motion tracker. Each friendly combatant has a randomly assigned name and rank, which are based on Bungie staff and notable community members and are not tied to their in-game models.

Original
Below are the names used in the original version of Halo: Reach.

Halo: The Master Chief Collection Reach Port
When Halo: Reach was added to Halo: The Master Chief Collection more names were added to the list of possible names, here is a list of all the newly added names.

Trivia

 * Brent Abrahamsen's callsign is "CASH", which is fitting as he is Bungie's Chief Financial Officer.
 * Brian Jarrard's callsign "SKCH" is a reference to his gamertag.
 * Troopers may sometimes be assigned opposite gender names.