The Automatic Rifleman (AR), or Light Machine Gunner (LMG), is an individual within the fireteam that operates an automatic rifle, or a light machine gun.
His role is providing a high volume of automatic fire for the purpose of establishing fire superiority, and as such providing suppressing or covering fire.
The Automatic Rifleman is well versed in the characteristics of his weapon, and is able to provide specific types of fire, such as point, suppressive or area fire. The Automatic Rifleman is also often the Breacher/Point man when the fireteam is in CQC situations.
The primary weapon of the Automatic Rifleman is either an automatic rifle such as a M27 IAR, or a LMG such as a M249, or a PKM/PKP (technically GPMGs).