From Halopedia, the Halo wiki
Universe and lore
The following are locations on the map that are so named on the player's heads-up display during gameplay:
The map was first shown unnamed in the A New Generation trailer, and was eventually shown in more detail with hints to its setting in the Halo Infinite Multiplayer Overview trailer. Finally, in a Canon Fodder post on Halo Waypoint, Live Fire had its name revealed and further story details divulged.