Cheers. I listed the wrong mission too, I'm on the shanty town. Once past the roadblock the sniper rifle is next to useless. And the XM8 with no scope was making it a serious pain to get any further. Plus, I was really hurting for the under-barrel grenade launcher.
I've done the last stage of the previous mission and started again. Of course, without me being the sniper, my squad is getting cut down trying to clear the roadblock. Come back Ghost Recon 1, where you can control anyone!