Forums of the Megaverse®

Kevin meant for the original headhunter class to be all partial borg's, that is why he added the merc fighter in RUE.

A Headhunter is a lone wolf bionically enhanced type whereas a merc soldier is a trained soldier who works best with a group.

A Head hunter is Bobba Fett
A Merc Soldier is any of the nameless soldiers in the backround.

Rat Bastard caught this quite well. That's pretty much the difference. Also Remember that OCC apart in the world of rifts the difference between the Man At arms are always blurred at best.