Cobb

Cobb was one of the mercenaries working beneath Brennan, and ultimately for Christopher Henderson, during Day 5.

Day 5
Brennan, Cobb, and several other hired soldiers were sent by Henderson to kill Senator Wayne Palmer before he could contact Evelyn Martin. Sometime after Brennan and the van of mercenaries flipped Palmer's vehicle, Palmer (a former Marine) knocked out Cobb offscreen and took his weapon. At 9:39pm, Palmer surprised Aaron Pierce with Cobb's weapon, but relented when Aaron identified himself.

Cobb was named by Brennan early the next hour (at about 10:06am) when he explained to Henderson why they lost track of Palmer. It is not known if Palmer inflicted fatal wounds on Cobb.