Assault
From Halopedia, the Halo wiki
Assault is a game type in Halo where one team attempts to 'arm' a bomb in the opponents' base. In halo 1,the bomb is replaced with the enemy's flag (you have to return the opponent's flag from your base to score. The flag do not glow, nor it need to "arm" the bomb<see below>.It is just a reversed CTF)). This 'arming' action requires the player carrying the bomb to occupy a designated circle in the enemies' base for a predetermined amount of time. This is a task greatly aided by Sticky Arming. The bomb will be visible to all players when it is not being carried except in single bomb and multi-bomb games when a team has not removed the bomb from its original spawn site. However, once an opponent has picked up the bomb it disappears and can only be viewed when in line of sight or after the bomb has been dropped. It is easy to see due to its bright glow.
Variations
Note: Due to the most recent update a "BR" may follow the title of certain Assault games. This simply changes your starting weapons to an Battle Rifle and an SMG.
