Seriously, if the topic needs explaining then you're a moron, plain and simple....
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Let me clarify...yes..I invite them to the fire team...there is a reason I bought this game and a headset, and played the beta, etc. And as you can clearly see by the responses, there are plenty who "refuse" or don't use a mic...so again...in a social game...where A MIC HELPS. Get one...or go back to battlefield.