Tom Clancy's Ghost Recon Advanced Warfighter 2/Search and Destroy

Locate the Outpost
There are several paths to the outpost. The first path is a small pass near the starting location,

Eliminate the Outpost
Eliminate all resistance in the outpost.

There is a sniper tower, although the solder there isn't generally looking in the direction of the team unless there is nearby combat.

Take out artilleries
Locate the two artillery pieces within the mountains. Each potential artillery cache will contain a few enemies, which can be flushed out with a few grenades.

Destroy the bridge
Enemy forces will begin to approach the bridge. You need to take them out, and plant C4 at the base of the bridge.

A helicopter will approach during the mission. Use the machinegun nest to take out the helicopter.