Most people say the noobs are the low KD or from a certain gun. I have figured out the truth. The true noobs are
[spoiler]the heavy ammo stealers[/spoiler]
Think about it, how many times have you been running to the heavy ammo and when you get there you see your teammates holding a rocket launcher.
Don't these people know how to wait. Please don't do this they only time to do it is if there's no teammates near you and you see enemies on your radar.
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I wait till I see another teammate, if an enemy is coming it will force me to grab it. Heavy ammo is a complete game changer though.