An easy way to earn extra points and kills during Deathmatches is to set up as many remote turrets and sensors as possible. You will be awarded extra points just for placing these, plus the turrets will attack and kill most enemies who come within its range, giving whoever set up that turret the kill points. The sensors allow the turrets to attack enemies that are longer distances away from the turrets position. This is also an easier way to hold a base during capture and hold missions/matches.