The game I'm trying to find is around 2010 ish. In one scene you started in a snow filled valley. You had to move to the end and there was an enemy located on the right side, with a cache of weapons and ammo. At the end of the valley you had to use the sniper rifle to kill the enemy to go on. There was a farmhouse, a lake that had an ammo airdropped in it for you. There was a camp that you had to break into and walk across a rope to get on the warehouse roof.