To become a sniper after you have compleated a few drills at the combat range and small arms range go the the sniper range. Complete 2 drills and then stand the traing brief. Pacmire or Rooker will ask if you want to become a sniper. Become a rear guard. You just have to be drilling with the shotgun and then once you get to your misson you will be assigend to rear guard in briefing. ( You better know your hand signals )