They look almost exactly like the grunt or heavy but they have different armor colors such as red, yellow, grey or bright green depending if they are heavy(red) or grunt(yellow) mostly than the standard blue. The mercenary commandos are the most deadly enemies to kill on sight as soon as possible because they are mostly seen to carry Rail Drivers that can kill the player in one shot. However like the grunts, they can use the Precision Rifles as well.