The Rebel Marksman is the sniper unit for the Rebel Alliance. This unit is used to pick off enemies from long-range, their gun has a double-zoom feature which allows you to really get close-up to the enemy. This means that you will have to aim ahead of the unit, but make sure you will get a head shot the first time. Otherwise, you will give away your position to the enemy and he will move around, preventing you from hitting him. In Star Wars Battlefront II, the Rebel Marksman and their fellow sniper classes do not get a targeting reticule when not zoomed in, but this is no hindrance to experienced players, who become quite good at hipfiring. (Equivalent- Assassin Droid, Scout Trooper, Clone Sharpshooter)
The Rebel Marksman is a very vulnerable unit, being able to take less damage than any other rebel unit besides the spy, which can take as much damage. The Wookiee Warrior is about 2 1/2 times tougher than a Marksman.