I must apologize if my proximity to team mates spamming it is the cause of this, but I must insist that it's not. As soon as the game loads up and the gun menu comes up, I start hearing it again in the dialect of whatever team I've been automatically placed on. Not just 'charge' but also the respective 'no', 'yes' and a couple of other things.
It seems to get less severe as the game goes on, so I suppose I'll just try to tune it out and move on. I appreciate anyone who read this and gave it a thought or two. If it IS team mates then the audio just carries a bit more than it probably should, and that's all.
Thanks!