It's where you make it to the Farm and they change the LZ on you and you have to haul ass back down the hill near the church and graaveyard.
No I got past it just calling air strikes over and over on hardened. I think I went to the right called in a strike, then right after that one about 20-30 ft past it and started to move up. I stayed right most of the way until you get to the downed chopper, then went as far as i could left and worked my way down final road followong my airstrikes, it took me a bunch of tries but finally was able to break through. I tried that part for about 20-30 min on Veteran today and its a major ***** on Veteran.
I finally gave up on the snipping part I cant even get past the part right after you kill the guy. There are just an ass load of guys waiting for you and they all just chuck grenades so it a major pain in the ass.