The Arma 3 alpha zip is all that I have in there. I even turned on show hidden folders

I had a similar problem but I think mine was due to playing with the settings in the Nvidia control panel. I restored them to default and the issue went away.

I am having the same issue in massive firefights (20v20 or so) too many guns being fired causes the audio to crack, I have tried increasing the sound samples to max and it still persists

Maybe orange, would cover most situations, sun rise and sun set would be bad but night and midday would work, and it might stand out against the terrain the best.

I agree but the marker in ARMA 2 was difficult to see in certain situations. I can't think of a color that would cover all scenarios.

I think it would be a good idea to have female models in the game because there is an increase of women in the military and there also more and more female gamers.

Possibly but there was a distinct glass shattering sound and it was attempted at long range and later close range. Also tried with the assault rifle and the pistol.

I just learned that the screen on the attack boats works fine.

Then it certainly appears to be an SLI issue since I'm running two 470 GTXs