Suicide attack

Were you also looking for Kamikaze Grunt, the Unggoy rank that mostly uses the tactic?

A suicide attack is an attack intended to kill others and inflict widespread damage, in which the attacker expects or intends to die in the process. In the Halo Universe, it is commonly, though not exclusively, used by Unggoy troops due to their cannon-fodder status, and the general disregard for their morale by their Sangheili or Jiralhanae commanders.

Canon incidents of suicide attack

 * Occasionally during combat in Halo 3 and Halo 3: ODST, Unggoy troops will enter a "berserk" mode, similar to that of the Jiralhanae, but instead will brandish a pair of ignited plasma grenades and rush the player. Headshots can easily deal with these Kamikaze Unggoy if spotted quickly, but if in large numbers, or if the player does not notice them until too late, they can be a devastating force. Similarly in Halo 3: ODST, the Huragok were forced to don armor that will explode if it takes too much damage, dispersing smaller charges in a wide radius.
 * In Halo Wars, Suicide Unggoy are units produced by the Arbiter faction, which run at an enemy structure and ignite their gas tanks, producing an explosion greater than a grenade.
 * Suicide Unggoy also feature in Halo: Ghosts of Onyx, successfully deployed as a diversion to distract Spartan forces as a battalion of Sangheili make ready to attack the Core of Onyx.
 * The Covenant are not the only faction that use Kamikaze tactics. During the Battle of Installation 00, pilots of Longsword fighters too damaged to return to their ships attempted to smash their fighters into enemy ships.