Since I clearly don't pay attention, the "red diamond" setting is actually in the in-game options menu labeled "Target Marker" ... you should un-check it for a more realistic experience.
I noticed that in the options, but considered it may be for something else because you guys were messing with config stuff to find an answer. I'll go switch that off myself.
It is not the technique that wins a fight, but the more furious mind - Kodiak WOF
You are stuck on stupid. I'm not going to answer that question! - Gen Honore, New Orleans Sep 05