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 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.

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.
 * C. Errera, the soldier referencing Claude Errera, was previously mentioned in Halo 2's Conversations From the Universe. In it, he was noted to be a deceased Corporal sniper spotter who recorded a conversation between two Grunts during the Fall of Reach.
 * Troopers may sometimes be assigned opposite gender names.