The Speed runner Merc, This guy has very little armor, which lets him run fast, move fast, and think fast. Instead of a rifle, a pistol, and a melee, the Speed runner Merc carries only a single Desert Eagle to kill their targets, all for that PR baby!
The Marksmen Merc, This guy is very hard to see, and you'll only see a glimpse of a glare before you're dead. This mercenary likes to hide in very smart spots, and has a very quick target time, so forget about trying to distract him. Explosives are smart, so long as you can guess correctly where he is.