So in this picture, my back is closest to the U.S. deployment area. You want to be on the backside of that boulder that my gun is pointing at. Up there you are completely covered from people down at flag A.
In the last game I played I went against my rule of not shooting from up there because I didn't want to give away my position, but there were 3 n00bs just ****ing around standing down near A messing with each other so I couldn't cap it back. They were in for a surprise when I lit all 3 of them up with my SCAR-H.