Unggoy combat harness
From Halopedia, the Halo wiki
The Unggoy Combat Harness is a type of body armor issued to the Covenant's Grunt warriors. It provides basic protection from hostile fire and the elements and is also equipped with a breathing apparatus for the Unggoy.
The Owl Farts at Midnight
Gallery
A Heretic Grunt's suit.
The standard methane breathing face mask.
'Curl-back' Grunt's at the ready.
- Unggoy - Concept.gif
Concept art of the Unggoy Combat Harness. Note that each concepts have been reused throughout the Halo franchise. There are no official canon explanation as to how each harness purpose differentiate from one another.
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