Hmm just come across someone with a view distance cheat/found game bug or something similar.
He was the co-pilot of the chinease attack heli on Fushee pass and everytime I was in the american attack chopper he would shoot at me with a tv guided missile from the other side of the map and hit, you could see where the missile was coming from but he was miles away. I realise that sometimes they are just abit too far out of sight, but he wasnt. He was always miles off. There is no way he could have seen me as I couldnt see him and my settings are max including draw distance.
Then when he took the chopper out, people were racing to it and jumping in it and bam he would hit it before it took off, from no where.... , jump into the stinger or linebacker and nope, no lock. :S
He also had the very first class rank as in not even reached an unlock rank, so wasnt as if he was pro or anything.