Here is my class idea:
Name: Pathfinder
Position: Support/Assault
Health: Low
Equipment: An SMG (mp5k perhaps?), laser pointer, smoke grenade
Description: Pathfinders are used mainly as quick assault and support units. They move fast, but are really weak. They have an SMG, which is weaker and less accurate, than commando's rifle. Their special ability is too mark enemy units for their teammates. They mark enemjes, by pointing them with their laser pointers. The enemy will stay marked for as long as they are hit by the laser. Marked enemies take 1.5x damage from any weapons. The pathfinders can also deploy smoke for their teammates. Another weakness of the pathfinder is his lack of melee weapon and uses his fists for close combat.
I don't have a picture, but they could look a bit like a combination of commando and support