Appears in: Halo: Reach
The grenade launcher can take some getting used to, but it packs a punch for those who know how to use it. It does more than simply lob an exploding projectile—if you hold down the fire button, you can determine exactly when the grenade explodes.
Let go of the trigger as the projectile is flying by an enemy's head and they're toast. Even a direct hit may kill another player. And to top it off the grenades let out a burst of EMP, crippling vehicles.