McLeast

Halo Combat Evolved E3 Trailer
McLeast was Dropped off by a Pelican with his squad consisting of Sergeant Stacker, Goth, Lang, Sigure, and one unnamed soldier along with a Warthog, after being briefed on the mission by Stacker in which he is shown to be in Goth's Team and due to his accent of Scotish or Irish decent.

After boarding as gunner in the Warthog his team journey to the objective building where he successfully destroys an enemy Wraith. After Sergeant Stacker arrives he is ordered to hold the enterance with Goth, although when Stackers team comes under attack he rushes in to help them only to see his Sergeant killed before his eyes. He and Goth flee the building and on the outside tells that he will cover Goth's escape, although he is shortly shot, while lying on the ground he pulls out a Frag Grenade and detonates it killing all but 1 Elite but preventing the remaining Elites from chasing Goth.