Grunts
From Halopedia, the Halo wiki
Grunts
heighth: 5 feet tall strength: weak
More Info:
Grunts tend to travel in packs and stick close to more powerful allies. Individually they are easy to defeat, but in groups they can overwhelm careless Marines. Their armor seems to house some sort of lfe support mechanism. They are known to use a variety of weapons including the plasma pistol, plasma rifle and plasma grenades.