Tom Clancy's Ghost Recon Advanced Warfighter 2/Joining Forces

This mission has a significant number of rooftop snipers.

Assist Loyalist Forces
A few enemies will be in the path to a team of loyalists who are under heavy fire.

Reach Allied reinforcements
Reach the allied reinforcements near the cemetery.

After you reach them, there is an incoming tank. Take it out with anti-armor weaponry. Note that you will have to wait for it to approach, since it is outside the mission area.

Establish contact
Head to the trainyard. This region has a large number of snipers located on rooftops, which are visible from the satellite map.