Antilon anti-personnel mine

Antlion Anti-Personnel Mines, are used by the UNSC and many other military services, being used as an anti-infantry role, as their explosive splashes yield more damage to unshielded targets. The mines will kill any unarmored opponent but will most likely deplete an armored opponents' shields so the attacker can move in for an easy kill. They are capable of both proximity and manual detonation.

Triva
The Antlion is not to be confused with the TR/9 Antipersonnel Mine from Halo 3 Multiplayer